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Scosche SLC4 Line Output Converter

Convert speaker connections to line-level preamp connections in mobile audio applications

126 Reviews | 9 questions - 11 answers

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Item #: 142SLC4

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Scosche SLC4 Line Output Converter

Overview

Our take on the Scosche SLC4 Line Output Converter

So you're trying to connect an amplifier without speaker-level inputs to a car stereo that doesn't have preamp outputs? It can be done, but you'll need a line output converter to make it happen. The SLC4 from Scosche can handle up to four speaker-level inputs and four RCA outputs — enough for a 4-channel amp or a multi-amp setup.

Scosche SLC4 Line Output Converter

So you're trying to connect an amplifier without speaker-level inputs to a car stereo that doesn't have preamp outputs? It can be done, but you'll need a line output converter to make it happen. The SLC4 from Scosche can handle up to four speaker-level inputs and four RCA outputs — enough for a 4-channel amp or a multi-amp setup.

Connect the speaker leads from your car stereo to the SLC4. It reduces the incoming speaker-level signals so that outgoing signals are compatible with the preamp inputs on your amplifier. You will then need to use two RCA patch cords (not included) to make the connections to your amp.

The SLC4 features adjustable gain settings on each channel, and it's compatible with any car stereo. Warranty: 90 days.

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so. You can also call an Advisor for more information.

Product is working very nice in my car after reading the instructions I got it together

Gregory, Antioch, CA

What's in the Box:

  • Line output adapter with attached plastic screwdriver
  • Instructions
Reviews

Scosche SLC4 Line Output Converter Reviews

Average Customer Review:

126 Reviews

Waste of time

Written by: Rick from Akron ohio on July 18, 2016

2005 Mazda Miata
Crutchfield Customer Review (What's this?)

Does what it supposed to do but good luck getting it to fit behind your radio. Also pay attention to the wires. Unit will not hold the wires from the radio. The wires consistently come out when trying to stuff unit in the dash. I ended up not using it

Pros: Does what it is supposed to do

Cons: Doesn't fit, wires come out

Scosche SLC4 Line Output Converter

Written by: Gregory from Antioch, CA on July 12, 2016

2000 Mercedes-Benz E-Class
Crutchfield Customer Review (What's this?)

Product is working very nice in my car after reading the instructions I got it together

Pros:

Cons:

Works Fine

Written by: James from Carlsbad, CA on June 20, 2016

2002 BMW 3 Series
Crutchfield Customer Review (What's this?)

I'm no audio expert, and the instructions leave something to be desired, so it took me a while to figure out that I didn't need to locate the amplifier in my car to hook this up. The SLC4 goes in the dash between the radio and the vehicle's wiring. If you take your time and make sure each wire is screwed in tightly, then the wires won't pull out when you're installing the SLC4. This is important because if you have limited dash space you'll most likely be doing a lot of contorting of the wires during installation. It was a real challenge getting this unit to fit in there with the radio. I had to take more of the dash apart to find a place to tuck the SLC4. I ended up cramming it above the radio, in a small space below the air vents. The radio sounds great, so the SLC4 is doing its job.

Pros: Does the job it's supposed to do.

Cons: Much too big, making it very difficult to fit. Unclear instructions.

Scosche SLC4 Line Output Converter

Written by: J from Philadelphia, PA on June 5, 2016

2000 BMW 3 Series
Crutchfield Customer Review (What's this?)

The Scoche SLC-4 is a mistake. It's very large, so it will be a struggle to jam behind the radio in the dash. But that's not the worst part... It is so cheaply made, that once you take the time to connect both harnesses, you've got to turn these very delicate, yet hard to turn gain screws. Then the screws just shattered. So, it's now behind my dash, and my radio needs to be cranked to 35-40 until you get listenable sound. I'll uninstall it once I get the time. I'm likely to send it back.

Pros:

Cons: cheap plastic, so LARGE, impossible screws.

Crutchfield response on June 7, 2016 Our Tech Support team reached out to help the customer. We'll either help him get this working the way it should, or help him return it for an exchange or refund.

Does what it says on the box

Written by: Daniel from Nashville, TN on June 2, 2016

2004 Chrysler Crossfire
Crutchfield Customer Review (What's this?)

Does exactly what it's supposed to do, and does it very well as far as I'm concerned. Yes, it is a bit on the bulky side, but I was able to fit it in my dash without too much hassle.

Pros: Good sound, several different setup options, reasonable build quality.

Cons: Pretty large, but that should be expected given all of the connections it supports.

Awful

Written by: Seelall B. from Clermont, FL on May 11, 2016

2008 Honda Pilot
Crutchfield Customer Review (What's this?)

awful gain control. Poorly made.

Pros: None

Cons:

Scosche SLC4 Line Output Converter

Written by: Anonymous from Danville, IN on May 9, 2016

2004 BMW 3 Series
Crutchfield Customer Review (What's this?)

Low quality

Pros:

Cons: Difficult to hook up. Wires don't want to stay connected. Low quality.

Crutchfield response on May 10, 2016 We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.

Scorched slc4

Written by: Josh d. from New Ulm, MN on April 27, 2016

1987 Chevrolet Corvette
Crutchfield Customer Review (What's this?)

This item was kinda big for in the dash and the wires wanted to keep pulling out and kinda noisy think this could of been a little better quality part or atleast have the option to purchase a better one only disappointment I have ever had from you guys keep up the good work

Pros: It worked as expected

Cons: To big to put in dash and wires kept wanting to pull out

Scosche SLC4 Line Output Converter

Written by: Jerry B from San Jose, CA on April 25, 2016

2003 BMW 3 Series
Crutchfield Customer Review (What's this?)

Poor instructions and to large to fit into my Dash. This product, I am told, is to turn down some of the voltage so your factory amp does not get overwhelmed by the input from the head unit. So you are supposed to hood it up inline between the factory pigtail converter and the headunit pigtail. You turn on the new head unit and set it to a volume setting of 27, then dial back the screws on this unit until no distortion is heard in the speakers. All of this is done with the blue box is outside your dash and the head unit is dangling from its wiring. Very cumbersome. Then you have to try to push all this back into the recesses of the Dash. This blue box is pretty big. And new cars have very little room any more (at least my bmw e46 is really tight). While pushing the box back into the nether regions of the dash, some of the wires pulled out of this unit, and require further messing around to get that fixed.

Pros: I guess it is needed so as to not harm your factory Amp

Cons: to large to fit modern cars. Not a good wiring connection.

Scosche SLC4 Line Output Converter

Written by: Todd from San Diego, CA on April 23, 2016

1990 BMW 325I
Crutchfield Customer Review (What's this?)

simple to use but can take up space in AN E30 325i BMW

Pros:

Cons:

Worked great

Written by: David from Milwaukee, WI on April 19, 2016

2002 BMW 3 Series
Crutchfield Customer Review (What's this?)

only 4 stars due to size. it worked perfectly, but getting that thing in the dash of a BMW 325xi was a bit of a magic trick. Bottom line--i didn't know i needed it, the sales guy knew i would. I called tech support a few times to go over the hookup, as always the tech support is hands-down the best in any industry. Another successful installation - thank you Crutchfield!!

Pros: worked as prescribed

Cons: just a tad large to get in the dash

SLC4

Written by: Zach from Muskegon, MI on March 31, 2016

1996 Ford Bronco
Crutchfield Customer Review (What's this?)

Works perfect, plug in and adjust the gain.

Pros: Easy to figure out and set up

Cons: Directions could be better but like I said it's pretty easy to figure out.

Does the job

Written by: tomd from albany, OR on March 29, 2016

2000 Pontiac Grand Prix

Flawless install and operation. Works exactly described

Pros: A passive device. Nice easy big terminations. documentation was easy to understand.

Cons: Foot print and form factor; Adds big section to harness, too big difficult to conceal in dash space. output trim pots need to be closer to surface improved access.

Better product out there

Written by: Jared from Texas on March 1, 2016

2003 Nissan Xterra
Crutchfield Customer Review (What's this?)

It does what it's supposed to... Really deminishes sound quality

Pros: It came with Head unit purchase

Cons: Poor sound quality

Works great.

Written by: 1m from Glen Cove, NY on February 8, 2016

Crutchfield Customer Review (What's this?)

Makes the factory speakers sound amazing!

Pros: Hooks up real easy. Makes the factory speakers sound amazing! Already pre-set.

Cons: There's one black wire that comes off the unit. Instructions don't say what it's for. I found out that it's the ground wire. Just connect that to the ground in the wire harness ground. I had to call Crutchfield to find that out. It's not really a bad thing, but I figured I would post this to save somebody a phone call.

Great product, look at dimensions

Written by: DanM from Illinois on January 17, 2016

2002 Mazda Miata
Crutchfield Customer Review (What's this?)

Great product. I neglected to check out the dimensions until the converter arrived, it is big. When installation is in a larger car its no big deal but this was going into a Miata. With a little wire added to the wiring harness adaptors the unit can be slid off to the side after the level adjustments have been made.

Pros: easily adjusted and works as advertised

Cons: its big

Scosche SLC4 Line Output Converter

Written by: Anonymous from Mississippi on January 14, 2016

Crutchfield Customer Review (What's this?)

Good converter for the price. I have used this on a few systems with no problems.

Pros:

Cons:

Works great!

Written by: BobS from New Hampshire on December 14, 2015

2008 Hyundai Santa Fe
Crutchfield Customer Review (What's this?)

This product works as advertised. Crutchfield rep helped me understand which configuration to use from the extensive instructions.

Pros:

Cons:

Works fine, no complaints

Written by: Jared H from California on December 3, 2015

1995 BMW 540I
Crutchfield Customer Review (What's this?)

Worked fine on my 1995 BMW 540i to drop the levels for the factory amp. The unit is bigger than it seems in the pictures and I had a hard time fitting it into the dash.I had to extend the wires off of my harness so I could fit it behind the radio.

Pros: Works as advertised, many different configurations

Cons: bigger than expected

Not needed

Written by: Max from Alabama on October 15, 2015

1991 BMW 318I
Crutchfield Customer Review (What's this?)

E30 w/o external amp has no use. Shipped as recommended part

Pros:

Cons:

Crutchfield response on October 19, 2015 Whenever you encounter a problem with anything you purchase from Crutchfield, please contact our Customer Support team. Purchases from Crutchfield can be returned or exchanged within 60 days of the purchase.

Flimsy

Written by: Syd from Milford, CT on October 6, 2015

2002 Nissan Maxima
Crutchfield Customer Review (What's this?)

Difficult to connect / adjust. adjustment screws broke right away - couldn't adjust - wound up not using altogether

Pros: none

Cons: very poorly made

Easy to use

Written by: Ryan from Missouri on October 4, 2015

2005 Chrysler Crossfire
Crutchfield Customer Review (What's this?)

The box is easy to use but is a little bit big for tight spaces

Pros: Easy to use

Cons: Size

Good Product

Written by: GautamB from Minnesota on September 28, 2015

2003 Nissan Maxima
Crutchfield Customer Review (What's this?)

Its overall good product.

Pros: Good product, amplification level is good.

Cons: Screws are very light, a bit more press can break the tuning gain screws.

It Works but could be better

Written by: DD from Georgia on September 24, 2015

2003 Mercedes-Benz CLK-Class
Crutchfield Customer Review (What's this?)

The product works as describe but the terminals where the wires are connected would be better served as a vampire style terminal that would bit into the wire. When the wire is stripped it is hard to get the terminal screw tightened down enough to secure the wire into the terminal. If it was a vampire style, you could leave the jacket on the wire for a tighter fit and still make contact with the actual wire. The terminal screws are tiny and fall out when loosened enough to feed the wire in and sometimes will get lodged inside the plastic case. I had to open my case to get the terminal screw out again. This thing is huge and it is very difficult to find room for it in an already crowded console opening.

Pros: Works well when connected.

Cons: Wire terminals could be better to secure the wiring and the case is way too big.

Fragile as can be

Written by: Jason from Buffalo on September 13, 2015

1998 Ford Mustang
Crutchfield Customer Review (What's this?)

Does the job, but be very gentle when adjusting the gain

Pros: makes interface possible

Cons: super fragile

Good Product

Written by: Luke P from Indiana on September 10, 2015

2004 Mazda 6
Crutchfield Customer Review (What's this?)

Great product. installed it my self with ease.

Pros:

Cons: none

Good product

Written by: Matt from Toronto, Ontario on September 7, 2015

2000 Mercedes-Benz SL-Class
Crutchfield Customer Review (What's this?)

Works perfectly. Had a few issues as I felt that the manual was not detailed enough. The team at Crutchfield was more than helpful in clarifying what needed to be set and outlining the wiring for an R129.

Pros: Works brilliantly. Once you figure it out, is simple to set up.

Cons: Manual could explain a little more. A little bit big (packaging wise), had to extend input speaker wires.

Scosche SLC4 Line Output Converter

Written by: Anonymous from New York on August 30, 2015

1995 Mercedes-Benz SL-Class
Crutchfield Customer Review (What's this?)

A+++

Pros:

Cons:

Hard to control or change adjustments

Written by: ujjwalm from fairfax,va on August 26, 2015

2006 Hyundai Sonata
Crutchfield Customer Review (What's this?)

Nice product can do the job it require to. I tried this with my car. Sound was really low on driver/passenger speakers. On checking with customer service this is not required since i don't have subwoofer in the trunk. Tip - Use little stick on the side that is provided with scoche to adjust the gains. I realized it after i messed around some screws in adjustments.

Pros: Easy to wire and hook-up.

Cons: Hard to adjust gains. One needs to take the Radio out if there is any adjustment required. It would have been good if there was an adjustment provided via remote. small dash cars will have problem placing this unit.

Scosche SLC4 Line Output

Written by: TommyL from Rogers City, MI. on August 3, 2015

Crutchfield Customer Review (What's this?)

The unit was easy to install and getting excellent results. Pay attention to gain adjustment to keep hum to a minimum. I highly recommend this product.

Pros: Easy directions and small.

Cons:

Does the job

Written by: PhilH from New York on July 13, 2015

2007 Pontiac Vibe
Crutchfield Customer Review (What's this?)

Crutchfield included this in my installation kit to interface between my JVC KD-R660 and my 07 Pontiac Vibe with the factory Monsoon audio system. The Scosche SLC4 was necessary to adjust the line output from the receiver going into the factory amp.

Pros: Crutchfield support talked me through why I needed this unit and how to install it - they're the best.

Cons: No specific installation instructions were included, but as stated above, Crutchfield tech support provided what I needed.

LOC

Written by: Kevin from Houston Tx on July 6, 2015

2014 Ford Mustang
Crutchfield Customer Review (What's this?)

Works as advertised. Paired this with a alpine frv300 amp for mids and highs and made a huge difference over Stock head unit.

Pros:

Cons: wish it had somewhere to attach a remote wire for the amp.

Didn't know I needed it, Crutchfield did

Written by: da from Florida on June 24, 2015

2005 Honda Element
Crutchfield Customer Review (What's this?)

Researching the stereo for a non-specified vehicle, I saw the install kit. When I specified the vehicle, the kit price jumped to twice as much and this device was included. I didn't think I needed it, but Crutchfield knew better. Glad I trusted them, because if I had just bought the stereo, I'd be pulling my hair out, scrambling to find a way to properly run the stereo to the factory amp.

Pros: Sound is clean and wire mapping was simple.

Cons: You need extra space behind the dash to house this device.

You will need this

Written by: Tom G from California on June 21, 2015

Crutchfield Customer Review (What's this?)

You will need this to wire a stock radio to a RCA amp.

Pros: Works Great

Cons: None

Simple and effective, but a warning!

Written by: John from Kansas City, Mo on June 21, 2015

2006 Toyota Tacoma
Crutchfield Customer Review (What's this?)

I needed this unit to wire my alpine head unit to a 5 channel amplifier. The head unit only had RCA outputs for the subwoofer, and just the wire harness for the rest of true channels, and they were amplified by the internal amplifier, so this unit was the converter I needed. The instructions were very straight forward and easy to understand, and taking my time I had zero issues with the connections required. WARNING: Make sure you adjust the levels on this unit BEFORE you stuff it in the dash and install your cosmetic trim, or you'll get zero sound from your new amplifier, causing at least 3 minutes of confusion and head scratching. Derp. Overall, an excellent product that performs well. Crutchfield's tech support and customer service are, as always, TOP NOTCH! 5 stars all around.

Pros: See above

Cons: be careful not to tighten the sets crews too tightly. Take it slow and easy, and you'll have no problems.

Perfect

Written by: DaleC from Pennsylvania on June 2, 2015

Crutchfield Customer Review (What's this?)

I originally didn't think that I needed this part for my 04 Hyundai Santa Fe but after putting wiring the stereo harness to the car I didn't get any sound so I called the help line. The tech understood my problem and echoed that he also didn't realize that his vehicle had an external amplifier under the passenger side seat. Once I located it I knew that this part was in fact necessary in order to utilize the Monsoon sound system installed in the vehicle. I wired the harness to the converter, leveled the sound dials, and slid it into the cavity behind the stereo. It was that easy and the sound is incredible!

Pros: does what it is supposed to do, instruction manual details the diagram for the order of wires to be sequenced with the converter.

Cons: the dials should have a number sequence so that you can set each dial equally with the others which would make the leveling of your sound a not so tedious task.

Great Product

Written by: Sarah from Virginia on May 26, 2015

2006 Toyota Corolla
Crutchfield Customer Review (What's this?)

Great product for needed installation. Staff was very helpful during the whole process.

Pros:

Cons:

Scosche SLC4 Line Output Converter

Written by: Anonymous from Azalea, OR on May 11, 2015

1987 Chevrolet Corvette
Crutchfield Customer Review (What's this?)

Great price and worked great.

Pros:

Cons:

good product

Written by: BMAC from Utah on May 7, 2015

2002 Mazda Miata
Crutchfield Customer Review (What's this?)

I had read several reviews and had some concern about this product. I found that by following the instruction it did exactly what it was made for and the sound control was amazing. Just need to add enough wire to the harness to be able to tuck it in the dash.

Pros:

Cons: none

Versatile, does the job

Written by: Alex from Illinois on April 30, 2015

2005 Hyundai Santa Fe
Crutchfield Customer Review (What's this?)

Used this to adapt an aftermarket head unit to the Monsoon amp in my 2005 Santa Fe, works well. To make sure I had a snug connection for the thin wires in the 2 harnesses (probably 22 ga) I stripped them to about 3/8" then folded them back double and tinned, gave a very secure hold by the screws. Adjusting the levels to the same for all channels is a little tricky because of the way the pots are recessed in the case. I set one channel in the car and then took the harness assembly in the house and set the other 3 using a flashlight and magnifying visor to see the position of the markings. Would have been much easier if the pots were at the surface and/or had detents. I used the recommended process for setting the levels so it starts to distort at 3/4 volume but found with some sources I didn't get enough - went back and set it so that I started to hear sound at about 3 out of 35, much better. Unit is pretty large because it can be used in 4 different ways, I have lots of room in my dash so no issue but I can see how some might have a problem fitting it in. I would have preferred to be able to get a harness with RCA's that would go direct like they had for my Avalon with factory amp but it wasn't available. At least it was half price with my order.

Pros: Works well to match levels using factory amp, versatile for other applications

Cons: Tricky to see pot settings, large case due to multiple functions, not free with order

Great customer support

Written by: Jason from Colorado Spgs, CO on April 29, 2015

2000 Nissan Maxima
Crutchfield Customer Review (What's this?)

Needed this for my sons Bose system. Had a question and tech help was there. Awesome. Love Crutchfield

Pros:

Cons:

Scosche SLC4 Line Output Converter

Written by: Adrian G. from Jamaica, NY on April 26, 2015

Crutchfield Customer Review (What's this?)

It's not bad, I just think adjusting the settings to maximize the clarity at top volume left some to be desired.

Pros:

Cons:

Willing to sacrifice audio quality?

Written by: DenCon from Ellensburg, WA on April 12, 2015

1996 Saab 9000
Crutchfield Customer Review (What's this?)

Let me start by saying that I'm a tinkerer (I'm an IT tech) - I repair electronics that are not meant to be repaired and I'm not afraid to experiment; I'm a perfectionist - perhaps a little OCD. This LOC (line output converter) does what it is supposed to do - supports a variety of installation challenges; but audio dynamic range suffered in my situation. I used it to connect a Nakamichi NA250BTR to my 1996 Saab 9000 Nokia amp (has a good reputation). It killed ground loop noise, but bass and treble were flattened - the music lost its audio soul (all that survived was mostly midrange). I tested this by switching from line-level connections without the LOC to line-level connections with the LOC and I noticed a big loss in audio quality. If I tried grounding this unit with its built-in ground, the ground-loop noise returned with a vengeance. The included instructions are somewhat unclear. Connecting and adjusting this unit is a delicate operation, as the tiny pots (volume controls) are delicate, as are the wire clamps, and the included tool is pretty wimpy. Take extra care to make the adjustments uniform, as there is no indexing or other means to assure uniform adjustments from one channel to the next. Having said all this, if you have a complicated installation and are willing to sacrifice some audio quality, this unit will get you going. But if you are willing to put in more money, time and effort, you might be able to do without - and get better results in the bargain.

Pros: Flexible Filters out unwanted noise Appropriate for the beginner

Cons: Unclear instructions (lack detail), tech support is basic Audio quality suffers

I guess it works

Written by: Dude221 from Florida on April 1, 2015

Crutchfield Customer Review (What's this?)

I guess it works because there is no popping noise and the stereo sounds great. I went by Crutchfield's recommendations to install this and everything works fine. As a newbie, I did not know how or where to install the device--I thought it went through the RCA jacks into the car's amp. After removing removing the rear seats and interior trim I discovered the amp had no where to attach the converter. I called Crutchfield support and they told me to install it between the car's wiring and the new receiver's wiring. The converter takes the place of the wiring connectors. You unscrew tiny screws in the converter, slip in the correct color-coded wire from the car's wiring and tighten the screw. Then you do the same on the new stereo. I wish the instructions on the converter were a little more simplified for novices like myself who have no clue as to what the device is doing. A picture of the new stereo wiring---> converter---> car's wiring would make things simpler. Make sure all the wires are tight and not touching each other ( or else the speakers won't work).

Pros: Works well.

Cons: Difficult to follow instructions for a novice.

Junk

Written by: Anonymous from Leesburg, NJ on March 22, 2015

2010 Hyundai Sonata
Crutchfield Customer Review (What's this?)

Speaker wires kept coming out. Screws are so small I had to use eyeglass screwdriver. Cheaply made junk.

Pros: Only good thing about it- it did the job, barely.

Cons: Absolute junk, poorly made, screws way too small, wires kept coming out even when tightened.

SLC4

Written by: Shane from Florida on March 17, 2015

2007 Scion tC
Crutchfield Customer Review (What's this?)

First off, let me say that this product works in my 2007 Scion tC with a stock head unit. With that being said, the product is very average.Would i recommend this to you? If you have after market subs, then yes, however, if you do not, I would pass because this LOC has little to no bass. I don't know if they just made it that way or what, but it just doesn't push any bass through, and i actually about the bass problem after buying it, and can confirm it. It does do its job though, and I am happy with my purchase. Lastly and please read this! You must use 16 gauge speaker wire! You might be able to get 14 gauge to work but it will be a pain in the butt. The screws that hold the wiring are too small for 14 gauge. Please, lol, use 16, it will save a lot of frustration. It holds 16 tightly.

Pros: Works fine Pushes great highs

Cons: Absolutely no bass Frustrating Install

Didn't work

Written by: BrianS from Oregon on March 8, 2015

2005 Honda Element
Crutchfield Customer Review (What's this?)

Didn't work. Even after talking to Tech support.

Pros: none

Cons: no worky

Scosche SLC4 Line Output Converter

Written by: Mike C from Mechanicsville, va on March 3, 2015

2005 Ford Explorer Sport Trac
Crutchfield Customer Review (What's this?)

Product works, but wire connections are not strong enough to hold when some stress is applied.

Pros: Works as described

Cons: Wires kept pulling out of slots no matter how much tightened down

scosche

Written by: DR from eldersburg, maryland on December 18, 2014

Crutchfield Customer Review (What's this?)

works great did exactly what crutch field said it would.

Pros: ComPact

Cons: Have to shove behind head unit.

Scosche SLC4

Written by: Russ from Beavercreek, Ohio on December 7, 2014

2008 Pontiac Vibe
Crutchfield Customer Review (What's this?)

The Scosche SLC4 was required with the factory sound system in my car. The instructions are just a little vague but the tech support team at Crutchfield made it really easy.

Pros: works great

Cons:

Confusing manual

Written by: Madkins from Omaha NE on November 18, 2014

Crutchfield Customer Review (What's this?)

Easy to use with Crutchfield's help, but has multiple set-up options that I could not figure out independently.

Pros: Easy to use with help

Cons: Manual is confusing

great product

Written by: stand from north carolina on November 16, 2014

Crutchfield Customer Review (What's this?)

great

Pros: easy

Cons:

Works great

Written by: J from Clanton, AL on October 8, 2014

Crutchfield Customer Review (What's this?)

I purchased a S/O amp without speaker level inputs due to a great price. Used this product to wire it up. It took some additional time to install but was worth the trouble as the sub sounds great

Pros: Installs easily

Cons: Takes up additional space

not needed

Written by: tylerg from anywhere Georgia on October 2, 2014

Crutchfield Customer Review (What's this?)

This part was not needed shouldn't have been offered or suggested i needed it since i was receiving the installation kit

Pros: It wasn't too expensive

Cons: Didn't need it

Crutchfield response on October 13, 2014 The SLC4 was added to your order because, while the stereo does have 4-channel preamp outputs, those outputs only pass a 2-volt signal. The vehicle's sound system needs a higher voltage in order to sound its best. You are welcome to return the SLC4 if you aren't using it, but our professional recommendation is that your audio system will perform better and sound better with this adapter in place to step up the voltage to your factory amp.

Perfect

Written by: FS from Navarre, FL on September 14, 2014

2007 BMW 3 Series
Crutchfield Customer Review (What's this?)

Works as it is suppose to and easy to install.

Pros: No modification

Cons: None

Pretty good product.

Written by: Brian A from Saugus MA on August 26, 2014

Crutchfield Customer Review (What's this?)

Works as intended. Kind of big to fit under the dash. Make sure you tin your speaker wires or the clamps wont hold. Installed in GMC Jimmy with Bose system.

Pros: Good instructions.Good price.

Cons: Kind of big to fit under the dash. If I made this i would put a harness with a plug on each end of the box and provide 2 plugs. One to terminate the source wires and one to terminate the wires out to the amp. Also the ground wire is fairly short.

no room

Written by: william from ca on July 14, 2014

2001 BMW 3 Series
Crutchfield Customer Review (What's this?)

the product works fine, this is the first time that I have issues installing a stereo on a car, there is no room in the car to install this without modification and the instructions were not accurate at all,

Pros: sounds good

Cons: not for just anybody to install you have to have some experience you need to take lots of parts out to get to it.

Meh...

Written by: mBrane from US on June 28, 2014

2008 Kia Sorento
Crutchfield Customer Review (What's this?)

So, Crutchfield indicated that this was mandatory for the pairing of my new JVC KWHDR81BT CD Receiver with my 2008 Kia Sorento. No. Not accurate at all. Here's the trick; if you tune the SLC-4 using Bluetooth as the source, the output is louder and you'll leave the output pots cranked down a bit from max. Then, after wrestling the SLC-4 into position, mounting my head unit, and buttoning up all the trim, I was *underwhelmed* when I heard an FM source. I could max out the head unit without distorting the sound! It infuriated me that I was "leaving something on the table," so off cam the trim, out came the unit, and out cam the SLC-4 for more tuning. I ended up maxing out the SLC-4, which is the same as not even having it in line at all! So, now I have an extra piece of gear in my audio system waiting to fail, while also creating higher-resistance connections, because I would have connected directly and used solder instead. I just *love* knowing that there are 16 screws holding in the wiring in the SLC-4, any of which could work its way loose at any time. So, I've got *that* going for me!

Pros: - flexible support modes

Cons: - pots are recessed and require a screwdriver (forget that plastic simulation of a screwdriver that they attach to the unit for your convenience. Worthless. Use your own.). - pots should have long plastic caps that can be twisted with your fingers. Geesh! - too big!

Crutchfield response on July 8, 2014 Our Tech Support team reached out to the customer to troubleshoot the situation. If it turns out that the SLC4 is not needed, the customer can return it for a full refund.

Madza Miata Boss System

Written by: Anonymous from Schaumburg, IL on June 21, 2014

2004 Mazda Miata
Crutchfield Customer Review (What's this?)

Excellent I was not sure why this was needed but wired per instructions. Set up in car bf closing to make adjustments all of the sudden I hear back speakers which I could not hear or adj in original Boss stereo!!! Balance all with pot adj and works great

Pros: Speakers sound great

Cons: A challenge to fit in tight area for stereo notch room plenty of wire so set off to side w double stick tape and fine

Line Converter

Written by: Frank C. from Bothell, WA on May 23, 2014

2003 Mazda Miata
Crutchfield Customer Review (What's this?)

My 2003 Miata has a Bose Amp and speakers installed at the factory however the inputs to that amp are wired through a wiring plug rather than using RCA inputs.This device allows your aftermarket stereo to use factory amplifier systems without being overdriven. Without this device I would have had to run all new speaker line to bypass the amp. The factory Bose amp puts out more power than the aftermarket head unit by itself, so it would have been ludicrous not to use it.

Pros: Easy connection screw terminals, and simple to set up.

Cons: Just one more thing to tuck into cramped dash space

Works, but can be a pain to install

Written by: PD from Denver, CO on May 13, 2014

2005 Pontiac Vibe
Crutchfield Customer Review (What's this?)

This thing worked as promised, but not without some hassle. Splicing it in between the new stereo and the wiring harness was a bit of a pain, and then it was really challenging to get it into the dash behind the stereo. Seems like for what it is it could be more compact. Instructions on setting the gain levels were pretty cryptic. Seems to be adjusted OK but perhaps it could be better? Will never know.

Pros: Works

Cons: Bulky; instructions very cryptic

Simple enough

Written by: JohnD from Ann Arbor, MI on May 13, 2014

1999 Chrysler 300M
Crutchfield Customer Review (What's this?)

It's simple enough. attach wires, make adjustments. done. You will need a small screw driver and patience.

Pros: Cheap, multiple setting and outputs

Cons: Instructions not clear. Need small screw driver.

good

Written by: Anonymous from Kissimmee, Florida on April 28, 2014

2006 Hyundai Santa Fe
Crutchfield Customer Review (What's this?)

It does what it's supposed to.

Pros: great price.

Cons: Did not understand the instructions well, Difficult to adjust

Does what it is supposed to do

Written by: Adam from Louisville, CO on April 27, 2014

Crutchfield Customer Review (What's this?)

Used it to connect to my factory Bose amp and seems to work fine. I had a little bit of distortion at first but then turned down the adjustment screws and disconnected the ground wire it comes with and much improved sound. Like most reviewers have stated it does appear a little cheap and I just hope it keeps working. Very hard to see adjustment screws and I was constantly worried about getting enough grip on the speaker wires w/out stripping out the tiny screws. Just have patience and it should work fine. I will keep my fingers crossed as to longevity. Overall, Crutchfield Tech Support was awesome quickly helped me find what I needed to do from the confusing manual.

Pros: Works

Cons: Seems kind of cheap (longevity?)

Scosche SLC4 Line Output Converter

Written by: AliS from Logan, UT on April 13, 2014

2005 Hyundai Santa Fe
Crutchfield Customer Review (What's this?)

We ended up having to buy a converter for this to be compatible with our car, which was pretty obnoxious, but other than that it works fine.

Pros:

Cons:

Didn't end up needing it

Written by: Shawn from Albuquerque on April 12, 2014

1994 Dodge Ram 1500
Crutchfield Customer Review (What's this?)

Didn't end up needing it

Pros:

Cons:

Not impressed

Written by: Sir Yarquest from Springfield, MO on April 7, 2014

Crutchfield Customer Review (What's this?)

We were having major issues getting a Kenwood Head Unit to work in an 06 Acura RSX that at one point had a Bose system in it, still had the factory Bose amp and Sub. Then the head was replaced with an older Alpine head unit, which work great with the factory Bose Amp and Factor speakers and sub, but the head unit was out dated. I did direct swap out but it did not work, we had power, no sound. We called and Crutchfield recommended this unit. It worked great for about 15 minutes. Then all we had was bass. Then it died. Ended up pulling all our own wires and bypassing the factory amp and installing a Kenwood amp for both front and rear speakers and replacing the sub with a Infinity 12".

Pros: Easy instructions

Cons: The screws are very cheap and super small heads. It only worked for a little while and then died. Bulky, hard to mount behind head unit.

Easy/ handy

Written by: Silly norwegion from Warminster, PA on March 29, 2014

1993 Saturn SL2
Crutchfield Customer Review (What's this?)

I had a new amp from a long time ago and never used it and decided lets put a bit of a kick in my 93 saturn but i had no rca jacks . Now i do lol this thing was perfect and hooked up easy.

Pros: Easy hookup.

Cons: None

Converter review

Written by: Ron from Chestertown, MD on March 29, 2014

Crutchfield Customer Review (What's this?)

Doesn't feel well made. I was really afraid I was going to break it during install.

Pros: Allows use of stock harness

Cons: Frail connectors and view of adjustments

Scosche SLC$ Reviwes

Written by: Javier from San Juan, PR on March 17, 2014

1995 BMW 530I
Crutchfield Customer Review (What's this?)

The fixtures works very good.

Pros: I love the fact that the outputs can be adjusted.

Cons: The size is too big and makes it hard for the installer the radio installation on the limited space inside the car dash.

ok

Written by: smb from Charlottesville, VA on March 6, 2014

Does what it needs to do

Pros:

Cons:

Worked Perfectly

Written by: Chris from Atlanta, GA on February 26, 2014

Crutchfield Customer Review (What's this?)

I was not ready to replace the head unit in my 1998 F-150 but the speakers had to go. Used this to install an aftermarket amplifier to my stock head unit.

Pros: Easy to install and conceal, and worked flawlessly. Perfect low-cost solution.

Cons: can't find any

Scosche slc4

Written by: ddaanniieelldd from mesa,az on February 3, 2014

1994 Chevrolet C Series
Crutchfield Customer Review (What's this?)

Did what it was intended to do

Pros: liked the screws to tighten down the wires

Cons:

Scosche SLC4 Line Output Converter

Written by: Anonymous from Lookout Mtn., GA on January 18, 2014

Crutchfield Customer Review (What's this?)

good product

Pros:

Cons:

Adapter for Factory Power Amp

Written by: RichW from North Carolina on December 29, 2013

1995 BMW 540I
Crutchfield Customer Review (What's this?)

Works well - works as advertised and instructed.

Pros: Easy to install

Cons: None

You need this item in your car sound system

Written by: cbp from Houston, TX on November 21, 2013

Crutchfield Customer Review (What's this?)

This device made my system nice and clean. I put this device right by my head unit and then ran the wiring back to my 4 channel amp. It made the signal strength great for my system. My amp does not have to work as hard because it is pushing the signal to my amp.

Pros: Compact and clean

Cons: only 80 amps per channel.

Scosch

Written by: WG from Plainview NY on November 9, 2013

Crutchfield Customer Review (What's this?)

Simple to use and works great- only problem I had was that I accidentally hit the button on the side when I was putting everything back together and it didn't work at first.

Pros:

Cons:

So easy a first-grader can do it

Written by: Nate from San Diego, CA on October 28, 2013

Crutchfield Customer Review (What's this?)

I'm new to car audio, and when I realized I'd need a Scosche adapter I was worried that I was in over my head. After opening the box my fears evaporated because it could not have been simpler. In fact, since all that was required was color-matching I let my 6 year-old daughter try her hand at some "Daddy work" and she loved it. I stripped the wires going in and she handled the rest. Sound quality was fine and everything worked great.

Pros: Easy to use and handle

Cons: It was bulky getting everything back into the console but if you want an easy fit you should make a system that doesn't require an adapter.

Scosche SLC4 Line Output Converter

Written by: Anonymous from beeville tx on September 30, 2013

Crutchfield Customer Review (What's this?)

works just fine

Pros:

Cons:

Scosche SLC4 Line Output Converter

Written by: Anonymous from Highland, CA on September 7, 2013

Crutchfield Customer Review (What's this?)

Excellent buy

Pros: This is great for hooking up an amp to a stock system! Very easy to install with great sound quality... No hissing

Cons: Can't really think of any

Did not need

Written by: DickF from Naples, FL on August 5, 2013

Crutchfield Customer Review (What's this?)

Was told at checkout that I needed this, but didn't. Crutchfield refunded the price.

Pros: don't know - didn't use

Cons: didn't need. seems complicated to install.

Perfect Solution

Written by: Al the Bassman from Westwood, NJ on July 31, 2013

Crutchfield Customer Review (What's this?)

This was the perfect solution. I had added a Sound Ordinance under seat subwoofer to my Subaru & was having issues getting it balanced to my factory stereo. Due to the low voltage output from the factory head I was forced to connect the speaker outputs to the line-in on the subwoofer. This caused the subwoofer's remote level control not to work correctly - too little bass or way too much, no happy medium. I suspected I needed to attenuate the factory head's output. So a call to Crutchfield's tech help & the tech recommended the Scosche SLC4. This unit would enable me adjust the heads output level so the subwoofer's remote level control would allow a full range of adjustment to get the bass level just right. Installation was easy; I used Velcro to fasten it under the seat on the carpet adjacent to the subwoofer. I did have to tweak the controls on the SLC4 & subwoofer to achieve the perfect balance to enable the subwoofer's remote level control to have a full range of usable adjustment. So everything is now perfect & I can even add or subtract bass on individual songs to my taste. Just one word of advice don't mount the SLC4 to the subwoofer enclosure as its internal circuit board is a bit loose & will rattle noisily with the music. Other than that it is a great solution & product for a reasonable price.

Pros: easy to install, works great, & price is reasonable

Cons: none

Good Product

Written by: Tim from Cincinnati, OH on June 27, 2013

Crutchfield Customer Review (What's this?)

Overall the installation was easy and technical support was fantastic. The screws to secure the wires are small and I read the prior reviews prior to installing the unit. Be careful and don't overtighten the screws and everything goes great.

Pros: easy to install excellent tech support

Cons: small fragile screws

did the trick

Written by: jim from Fresno, TX on June 10, 2013

Crutchfield Customer Review (What's this?)

worked fine for what i needed.

Pros:

Cons:

Scosch SLC 4 on 2011 Ford F 150

Written by: Jesse M from Kyle, TX on April 14, 2013

Crutchfield Customer Review (What's this?)

Great product if your wanting to keep your factory stereo

Pros: Easy to install. I gave it. 5 stars because I don't have to pay a lot of $$$$ for aftermarket stereo so I can add an amp

Cons: No cons

Great Little gadget!

Written by: AnthonyB18 from Mechanicsburg. PA on February 15, 2013

Crutchfield Customer Review (What's this?)

I bought this because I wanted to add a amp to my truck without removing the factory radio since it has sync. It installed in about 10 minutes. Works great!

Pros: Cheap, small does what it is intended to do without any issues.

Cons: hard to mount. I installed it in my glovebox so i could still adjust the settings and it worked out fine.

94 Mercedes S-class

Written by: Richard from Los Angeles on October 13, 2012

this was perfect for getting rid of the popping noises in my S-class after i installed my new headunit, i took the advise of somone on a forum and connected the 5V line out directly to the factory Bose amp, it worked, and it sounded great but every time i changed the radio station or changed tracks on a cd it would make a loud pop, it got to the point where i never used the radio or cd only my Zune, this cleared up my issues, and i installed one my friends Mercedes now hes a happy camper too.

Pros: does what it needs to, and adds 4 more rca outputs.

Cons: kinda big and hard to fit inside the dash along with the adapter harness.

Great little device for addressing some knotty issues

Written by: Old Car Guy from Texas on October 5, 2012

Being a vintage/classic car collector I ran into a bad problem in attempting to install a modern radio in a 1978 Lincoln Continental Town Car and this little guy solved the problem. For anyone having a Ford product of the 1970's era, Ford chose to use a common ground connection at the factory radio for all speakers. New radios cannot be installed with such a grounding scheme which will very quickly cause the amplifier section to overheat and fry. It gets hot enough before failure to be a fire hazard at worst or would melt a CD at best. Instructions that come with the device are pretty simple and straight forward. Finding a place for it in the dash may be a bit of a challenge but not impossible. Basically if you are needing to do an installation as the one I did this is the only game in town. Just make sure you have any modern radio grounded per that radio's installation instructions. No exceptions or reach arounds.

Pros: Get's the job done!

Cons: Size can make it difficult to find a good place to secure it.

Easy to use...must have for using

Written by: JimmyJ from Hartford, CT on June 25, 2012

Crutchfield Customer Review (What's this?)

You need this if you intend on using your factory amp...fairly simple to set up and install...just follow the directions - I needed one call to support and they took great care of me...in and out in 5 minutes on the phone and it worked perfectly...

Pros: Simple to set up

Cons: Feels a little cheap..."plastic-ish"...but it works

Just what I needed.

Written by: Bklynyc from DC on June 16, 2012

Crutchfield Customer Review (What's this?)

Works fine, did exactly what I needed.

Pros: Works great and priced right!

Cons: None that I've experienced thus far.

Great Product

Written by: Chris S from Baltimore, MD on November 22, 2011

Crutchfield Customer Review (What's this?)

Great overall product, definately recommend to anyone installing to a factory head unit.

Pros: Did just what I needed. Multi-use. Really can be the "brain" of your systems setup

Cons: Speaker inputs are a bit tiny.

MADE LIFE SIMPLE AGAIN

Written by: Z28guy from Munroe Falls, Ohio on September 21, 2011

Crutchfield Customer Review (What's this?)

This was just what the doctor ordered. We wanted to retain the factory amp but still use the aftermarket head unit we had. This made it possible to do both without cutting up the factory harness or trying to track down wires. A++

Pros:

Cons:

Hard to conceal

Written by: Anonymous from St Pete FL on July 23, 2011

Crutchfield Customer Review (What's this?)

Very hard to hide and fit in dash behind factory or aftermarket stereo.

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Cons:

Works Great

Written by: Buck from Michigan on May 28, 2011

The SCOSHE Line convertor Works as stated. Hookup was easy and the staff at Cructhfield, Helpful as always. The biggest negative with this box is the plastic case it is housed in and really has no way to mount it. You basically have to Zip tie it where you want it.But It works great. If you have a stereo with speaker wire outputs and want to run them in an Amp via RCA jacks, this box is a must and reasonably priced. Thanks Crutchfield.

Pros:

Cons:

Fixed the volume

Written by: Tim from Vermilion Ohio on March 15, 2011

Crutchfield Customer Review (What's this?)

This adaptable unit plugged right into my aftermarket harness, and after one adjustment solved my volume problem

Pros:

Cons:

It does the job

Written by: BartK from Bolingbrook, IL on January 25, 2011

Crutchfield Customer Review (What's this?)

This thing works, quite well too. The enclosure is however a bit on the flimsy side and taking care to read other users' comments on the frail components, I took care not too over torque anything. Use discretion, its a tiny screw not an engine shaft nut. Does the job as a LoC.

Pros:

Cons:

No good

Written by: Cincinnati Marine from Cincinnati on January 5, 2011

Tryed it in a 2000 celica and a 1997 Accord. Couldn't get my sub to do anything more than move slightly. Hooked the sub to a head unit in my 78 camaro that has rca jacks and it worked fine. Judging by the reviews, your rolling the dice with this thing. I gave it 2 stars because hook up was easy.

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Cons:

Works like a charm just need to know what your doing

Written by: carlos from Panorama City, CA on December 25, 2010

Crutchfield Customer Review (What's this?)

Just installed this blue beauty, its true what some reviewers said About the feel of it being kinda cheap, but i hooked it up to my wifes 2000 civic and the sub kicks with ease. It didnt take long to figure how To connect it, just read the instructions and it should be easy, i had No problems connecting it, its true it doesnt have usable mounting Holes but with a little ingeniuty and zip ties it looks professional. Once again i repeat, read the instructions and it should be super Easy. I had a harder time routing cable than connecting this superb Gadget!

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Waste of money

Written by: CraigE from Portland, OR on September 20, 2010

Crutchfield Customer Review (What's this?)

This product is just what my review states... a waste of money. First of all it didn't work; or I guess I should say it functioned, barely. I tried to use it to tap into my rear factory speakers in my 2008 Legacy. It sent a signal to my amp but it was very weak even with the gain all the way up, there was very little volume and what volume it did have, sounded terribly muddled. A direct connection from my MP3 player to my amp proved my amp and sub to be operating just fine but this little piece of junk just didn't work, despite my troubleshooting it Even a call to Cruthfield tech support yielded no results. I gave up and just ordered an amp with speaker-level inputs and voila! it worked like a champ. Not to mention it's not working properly or weak gain, (maybe I got a defective one but it's too late to return it now) but this item feel incredibly cheap. The plastic is very fragile. It's not durable. It fell off my speaker box (about 14 inches tall) on to our pergo floor and it busted in two! What kind of cheap nonsense is that? There are no mounting options for this either, leaving someone who wants a clean install to make it jimmy'd with zip ties or something else. I should have listened to the negative reviews of this product, instead of believing the ones that said it worked.

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Cons:

Eh

Written by: My_Fast from Philadelphia, PA on June 28, 2010

Crutchfield Customer Review (What's this?)

Didn't get it to work in my 2008.5 VW GTI. So I gave up and gave in and just bought a new headunit anyways with the outputs I need. Could have been easily been user error... buuuut I wouldn't bet on it. It feels ok enough, I didn't expect much.

Pros:

Cons:

Scosche SLC4 Line Output Converter

Written by: Anonymous from Columbus, OH on April 19, 2010

Since the 2005 vibe w/ moon and tunes package has an OEM amplifier, this product was suggested on another forum to decrease background noise. Seems to be working great so far. I wish there was more guidance as far as what to do with the black ground wire though. I've heard on other forums you can just tape it off, or ground it. I splice it into the HU ground/wire harness ground and that seemed to work ok. My complaint with this device is that the included screwdriver is terrible. Use your own screwdriver if you have one. Also, they say to be very careful not to overtighten. Well after the wires falling out about 300 times, i said "screw it" and tightened them down pretty good. They seem to be staying put now. Just takes a few times to get the feel of how hard you need to tighten. Give the wires a little tug, if they fall out, tighten harder.

Pros:

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Crutchfield should offer a better LOC

Written by: David from OR on January 25, 2010

I grabbed one of these in a pinch. It does the job and is inexpensive, but it's also cheap. Cheaply made, cheap feel, not very confidence inspiring. When connecting wires to the inputs the tiny screws don't give enough bite and you feel like you're going to break them before you get a solid connection. Gain control dials are also fragile feeling and others have commented on how easy they are to break. There are other, better options on the market that Cruchfield should consider. - D

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Great Product

Written by: BumpinResponsibly from Pittsburgh, PA on December 8, 2009

I put this in my 2005 Ford Taurus because getting a head unit and a Dash Kit is very pricey for my model. I worked with a professional mechanic installing it. What we did was tap into the rear speakers so I could run a subwoofer amp. It works great but the only thing is you miss out on having more control over your amp than you would have if you got a new head unit. But if your looking for something that gets the job done right, get this LOC. After having this for a long time, I finally decided to just get money and get a new head unit and dash kit. Great sound quality. Good Price. Easy to install. Get this product.

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Good unit

Written by: Evan from Cleveland, oh on August 28, 2009

Crutchfield Customer Review (What's this?)

I bought this unit to put in my 08 cobalt sedan. It was an easy install and it works fine. The only problem I have is that the speaker I tapped into lost alot of power and sounds pretty bad. In using it to power a 600 watt rms amp. The main problem I have is that my sub stops playing when I turnmy headunit up past 3/4 volume. But overall good unit.

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solid

Written by: haccord1024 from wisco on July 4, 2009

Crutchfield Customer Review (What's this?)

bought this for my honda accord. does exactly what it is suppose to. be sure to wire everything correctly, i accidentally switched the + and - speakers leads when wiring it and it killed the sound quality. only problem i had with it was getting the wires to stay in the connector pins. it was a real pain but i managed to get it work. keep up the good work crutchfield!

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Scosche SLC4 Line Output Converter

Written by: Bret from Valrico, FL on April 7, 2009

Crutchfield Customer Review (What's this?)

Good converter, works for the application I needed. Simple to install no problems. Great service from Crutchfield.

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Scosche SLC4 Line Output Converter

Written by: RRRRyyaann from Port St Lucie on March 26, 2009

I bought a slightly more expensive converter and it stunk. After much toiling with a Rockford Converter I said "forget it" and picked this up. I only have one set of speaker wires soooo I spliced them by adding 2 wires to 1 and made 2 positives and 2 negatives plugged the positives into A5 + A7 and the 2 negatives into A6 + A8 works like a charm. Now I have fully controllable left and right outputs and no feedback. SCOSCHE makes great wiring kits as well SUPERIOR QUALITY! GREAT PRICE! Bangin In Florida Holla!!

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handy

Written by: no from mt.jackson,va. on March 21, 2009

Crutchfield Customer Review (What's this?)

This piece comes in handy.i didnt want to remove my factory receiver because it had cd/cassette,plus steering wheel controls.Installation of this is simple as long as you keep track of your wires. i just used some easy connects and tied into the factory wires.The only problem i had was the input wires didnt want to stay in.I had it mounted and hid away but had to take it back out and remount 3 or 4 times because a wire kept coming loose.its worth the price.

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Scosche SLC4 Line Output Converter

Written by: John from Mechanicsville, VA on March 15, 2009

Crutchfield Customer Review (What's this?)

Bought this unit to add a subwoofer to my wife's 07 WRX wagon. Wanted to retain the factory head unit to keep cost down (and retain SIRIUS tuner). Installation wasn't too tough. First time using insulation displacement connectors...since the wagon doesn't have rear dash speakers that would have made for an easy location to tap in to. Instead I found the speaker wiring legend on a Subaru forum and tapped into the speaker wires that connect to the head unit. Mounted this unit in the glove box with double stick tape - eliminated the no mounting hole problem. Overall, good product.

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Cons:

Scosche SLC4 Line Output Converter

Written by: josh b from Montgomery, AL on February 9, 2009

Crutchfield Customer Review (What's this?)

Purchased this unit to install an amp and sub in my Mazda 6 w/ Bose system. Worked great, I simply removed the factory amp from the factory sub and cut the terminals that connect directly to the speaker then installed a couple of piggy back terminals, effectivly tapping into the stock sub signal after the stock amp. I ran leads over to the LOC, since its a mono signal you also need to jumper the + and - together. Worked no problem

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It's okay but be careful

Written by: Gary from Southern California on January 2, 2009

Crutchfield Customer Review (What's this?)

I purchased this a while back to hook up a sub-woofer to my existing system. I wanted to hook an amp and sub-woofer to my factory head unit in the trunk (to the speaker level outputs from the Bose system amp that is in the trunk.) This unit didn't work for me even though I verified it was hooked up properly to the wires going to the speakers. I verified all was well but, in the end, it took buying a different company's speaker to line level box and it worked great. It's too late to return this to Crutchfield but wanted all to know of my experience. The other issue is be VERY careful with the adjustment screws. I used a very small screwdriver and was very careful but after turning the screws back and forth a few times, the screw stopped stopping at the "full on" stop but instead would turn round and round. Ugh...

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Scosche SLC4 Line Output Converter

Written by: allen from middle on no where wv on October 10, 2008

Crutchfield Customer Review (What's this?)

Not what I intended to recieve when I ordered. When hooking up to a factory deck you need to know and be able to identify all factory wiring for the speakers, and you will have to rewire all factory speakers unless you tap into the wires and run this as an auxillary. I may be way off of mark here but it seemed a little more complicated to me than the average installer would want to tackle. I run a install shop for electronics and do not intend on using this product in the future. I purchased this to enable me to install a amp and subs to a factory stereo so the owner could retain his factory 6 disc shuttle. I would recommend for the novice installer to locate the four wire converter. All you have to do to install these is locate your rear speaker wires and tap into them and you end up with 2 rca outputs for your bass amp. Product does work as described with no problems. Just more complicated than needed for my application.

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Bullseye

Written by: Marc from Alpharetta, GA on October 6, 2008

Crutchfield Customer Review (What's this?)

Reviews are the only way for consumers to really understand how something is going to work for them. Most of what is written by the vendor has to be taken with a grain of salt. I've got to comment on this because, it did exactly what I needed and I was almost ready to spend hundreds on an aftermarket amp. Problem: Getting aftermarket head units to play nicely with 98' E320 stock Bose amplifier. Line out from aftermarket HU to Bose amp and you get a nasty thump when source is changed or volume turned to zero. I thought it was a flaw in the Alpine receiver. On to a new Pioneer DEH-P5000UB for bluetooth purposes (awesome!). I found the same problems. Also tried speaker out to factory amp but that option came with other issues like 'one click, too loud' and hissing on soft tracks. The Scosche SLC4 knocked these problems square out. Easy to connect. Adjustments were puzzeling. I just set all channels equal at half mark and set the mode switch to what sounded best. It delivered what Bose was looking for. 5 clicks into the volume and the sound increases nicely and has a solid full range as I continue to increase the knob. No clicks, pops or hissing! Only negative things to report are the cheap screw I/O connections and the mode switch needs to be wiggled for all channels to connect. BTW If anyone from Alpine product is reading, after 3 Alpine head units over the years, I'm back in the Pioneer fan club. Their head units for the money have won me over!

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Scosche makes better power cables.....

Written by: micah from Memphis TN on August 29, 2008

This product is too complicated to install for its quality and is somewhat tedious. The plastic is flimsy but, unfortunately its all I could find at the time of my last install. I am looking to install an MTX Thunder series amp to a factory head unit and then add the Polk EX series sub I just cant part with. (Polk got that series woofer Spot On) I was hoping to find something better but, so far no luck. I suppose if I cannot find something better I will need to return to this. Or perhaps go without..................the gain adjustment is far to sensitive. I would not call this item user friendly in any sense though it does work. If I cannot find something better I will keep looking for the high level input harness for the amp that I no longer have. To those considering purchasing this I recommend to keep looking or find an alternative.

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Scosche SLC4 Line Output Converter

Written by: Reagan from San Antonio, TX on August 9, 2008

Crutchfield Customer Review (What's this?)

I Just installed this in my 2008 Dodge Ram 1500 QC and it was very simple and easy. One of the reasons i bought this is because i got Sirius Satellite radio free for a year and didnt want to lose that with another aftermarket radio. but ill probably exchange this out with my old pioneer for the high and low pass filters for better sound quality.

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great product

Written by: alexander from new jersey on July 27, 2008

Crutchfield Customer Review (What's this?)

have this installed in my 04 accord coupe. This converter does its job exactly as it should. Running infinity 692.7i's in the rear and kappas in the front with phenomenol sound quality and clarity. Pretty easy install as well only took a few minutes. Thanks Crutchfield!

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Scosche SLC4 Line Output Converter

Written by: Kevin from Seattle, WA on July 27, 2008

Crutchfield Customer Review (What's this?)

Definitely does the job however, the input pins (where the high level ins go) has a flimsy connector. The set screws do not hold the wires in well. If you have a lot of space (not behind the deck etc.) this may not be an issue but in tight spaces where wires may experience tension, the connector will likely lose a wire or two.

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Great Product For Adding An Amp 2 Factory System!!

Written by: kevycan from Conway, SC on July 13, 2008

This is a great product! Wired it up to my factory 1996 GM Monsoon CD Player & it sounds great! No noise, no problems. It Even comes with a manual to show you how to wire it up to any system that you have. I used it to put in a single subwoofer setup (1000 watt amp & Sony 12"), so I'am only using the rear 2 channel setup. Great product, highly recommended. VERY, VERY easy to install. Only downside is there is no screw holes for you to bolt it down to something. But, it's ok doesn't take away from a great product!

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Scosche SLC4 Line Output Converter

Written by: Jeff from Harrisonburg, Va on September 10, 2007

Had to take it out of the plastic case because there isn't any way to mount it, no holes to bolt it down. Doesn't even have holes to use plastic ties unless you count those little flimsy chicklets on the side, but they seem much better for snapping off and tossing at your girlfriend to irritate her than for securing the device to a mounting surface. Once out of the case it's actually nice, good thick double sided board, mostly good quality components (hate the plastic pots, flimsy), almost looks hand soldered. Maybe it is ??? haha. There are only three convenient ground pads on it that are worth trying to drill through to add standoffs so you can mount the board to something, but those three are in a nice wide triangle pattern that only leaves one corner kind of hanging out there on it's own unsupported. I don't find this a problem because I just put a forth standoff under the fourth corner and put aquarium sealant on top to cushion it and it supports the board just fine using the other three screws to actually hold it down. Performance is good. So well built it's certainly bigger than it needs to be, but not much you can do with those four big transformers in it. Like the connectors on it, and has good quality caps. Worth the money, and that's high praise in this day and age!

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Gets the job done

Written by: Jeffrey from Austin, TX on April 29, 2007

Crutchfield Customer Review (What's this?)

Easy install. Good price. Does exactly what it says.

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Scosche SLC4 Line Output Converter

Written by: Bobby from N. Fort Myers on April 25, 2007

This converter was very easy to install and to tune. The only things i didnt like about it is that i had to tape it to a panel and that the tuning screws are plastic(probably to keep ppl from twisting too hard)<BR>I didnt have any excess noise either.<BR>Well worth $20

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Scosche SLC4 Line Output Converter

Written by: indign from ct on April 8, 2007

Crutchfield Customer Review (What's this?)

It does its job as it is intended to do but it is so poorly made that mine actually broke in half (plastic split), so i had to tape it back togther.<BR>Like i said it will do its job but trust me, the saying is true you get what you pay for and if it were me i would pass this by and spend a little more on a nice piece of equipment.<BR>Also there is no way to mount it so you have to get creative.<BR>

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Finding the missing link!

Written by: Jason from Reno, Nv. on December 27, 2006

Crutchfield Customer Review (What's this?)

The Scosche SLC4 line level converter was exactly what I needed to connect my stock '06 Ram HU to my new Profile AP1040 amp. The adjustable gain controls allow for full control of the output signal. If you have trouble with distortion between your stock HU and your after-market amp, regardless of year/make/model, GET THIS!

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great item, it worked for me.

Written by: mgramlng from Memphis, TN on September 8, 2006

Crutchfield Customer Review (What's this?)

I bought this to hook up stock radio to my phoenix gold 400.1 mono amp and my 12" Kicker CVR..I called crutchfield and told them what I was trying to do, and they suggested this product...I had it in 3 days...Once I received this. I called crutchfield and they even told me what color wires to tap in to on my make and model of car..Which I thought was highly helpfull...After I got this installed it didn't work..So I called crutchfield again..They walked me through some trouble shooting, the unit was just bad..So the tech said he would send me one out the next business day..I had that item in 3 business days..It took me this time less than 2 minutes in install it..Worked perfect...Thanks a lot crutchfield..Great customer service...

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Decent for Price

Written by: Zack from Pass Christian, MS on July 11, 2006

This line-out converter works fairly well. It has three different settings, depending on how you need to use it. I installed it as a way to get a signal from my factory cd-player to my aftermarker amplifier. The signal quality was great, I noticed no noise. The instruction manual is the same size as the unit, so it can be kept in your glove box, or under the unit itself.<BR><BR>Pros: Three settings, Adjustable levels, good instruction manual, groundable, looks decent.<BR><BR>Cons: A bit flimsy, not high quality material.

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Buy it now!

Written by: Eric from Mililani, Hawaii on January 12, 2006

Crutchfield Customer Review (What's this?)

It's a great module, but what the heck is that little black wire that hangs off of it? Please let me know!<BR><BR>[<B>Editor's Note:</b> According to Crutchfield's <a onclick="sizedWindow('/S-5SLnwGJPVFS/popups/product_team2.html', 550, 500);return false" href="/S-5SLnwGJPVFS/popups/product_team2.html">Product Research team</a>, the black ground wire is to be used if there is noise in the system. If you have no noise, it can be taped off and left unused.]

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Details

Hands-on research

What's in the box?

Download the Scosche SLC4 Line Output Converter manual

  • Line output adapter with attached plastic screwdriver
  • Instructions

Product Research

Features

Overview: This is a versatile adapter that allows for multiple applications. If your receiver doesn't have preamp outputs and you want to connect it to an amp that doesn't have speaker level inputs, this adapter can be used to convert you receiver's speaker level outputs into preamp outputs. With this adapter, you can hook either a 2-channel or 4-channel amplifier to this adapter, and not lose fader control. This adapter also allows you to add an aftermarket receiver to either a common ground audio system in your vehicle, or an audio system that has factory amplifiers (like many of the Premium, JBL, and Bose audio systems). There are gain controls for both the line outputs and the factory amp inputs. Which gain controls you use depends on your application. Note: There is a plastic screwdriver that is physically attached to the adapter, and must be broken off to use. It is used to adjust gain controls and screw down the speaker terminals.

Speaker-Level-to-Line Level Conversion: The adapter can convert car stereo speaker outputs to RCA outputs so an external 2 or 4 channel amplifier can be added to a car audio system. There are line output controls that allow you to adjust the output level going into your amplifier(s). The adapter can handle up to 80 watts of speaker level input.

Interface with Factory Amplified Systems: This adapter allows the matching and installation of an aftermarket receiver with most factory amplified systems like the Premium/JBL/Bose systems.

Subwoofer Application: The adapter will allow for the integration of a subwoofer or subwoofers to nearly any audio system. There are line output controls that you can use to adjust the output level going into your amplifier(s).

Common Ground Audio Systems: With this adapter, you can add an aftermarket receiver to a common ground system in your vehicle without having to run new speaker wires. There are factory amp gain controls that you can use to adjust the input levels.

Common Ground/Factory Amp/Line Out Switch: Depending on how you are using the adapter will depend on what position the switch will be in. If you are adding a new receiver to a common ground system, then the switch is put into the "Common Ground" position. If you are adding the receiver to a factory system that uses Premium, JBL, and or Bose, then the switch is put into the Factory Amp position. You can also add an external amp to a receiver that does not have line outputs; in this case the switch will be in the "Line Out" position. There are factory amp gain controls that you can use to adjust the input levels.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

not needed [ Rupinder  Jul 15, 2016 ]
I don't even know what this is. [ Nicholas  Jul 12, 2016 ]
Required if you have a factory amp that you still want to use till you replace it [ Marc  Jul 04, 2016 ]
Recommended [ Raul  Jun 27, 2016 ]
Great addition. [ Itay  Jun 02, 2016 ]
part of installation package [ Vincent  May 10, 2016 ]
Required in order to convert to RCA in my 2013 Nissan Altima [ Harry  May 09, 2016 ]
perfect to match with OEM power amplifier [ Rafael  May 05, 2016 ]
When switching from MB oem radio to another, I'd rather have and not need than the reverse. [ Richard  May 03, 2016 ]
To use my factory amp [ HERIBERTO  Apr 21, 2016 ]
I didn't & not sure it will be needed - using pre-amp outputs on Clarion FZ105. [ MR JERRY  Apr 18, 2016 ]
packaged by crutchfield [ Terry  Apr 12, 2016 ]
To use my factory Bose amp and sub [ Graham F.  Mar 13, 2016 ]
I TRUST YOU THAT IT WORKS [ hector  Feb 10, 2016 ]
it fit my car [ Ethan  Feb 01, 2016 ]
Because the advisor said it would be compatible with my car :) I knew it would work:) [ Isaac  Jan 28, 2016 ]
To connect aftermarket radio with only two outputs to a 2008 Nissan Rogue with a Bose factory amplifier system. [ John  Jan 23, 2016 ]
This worked great for tapping into the speaker lines before the factory amp and feeding my Alpine amps for my JL Audio 10" Subs. [ titanium man  Jan 18, 2016 ]
this reduces the incoming speaker level [ MICHELLE  Jan 01, 2016 ]
This output converter is part of the Crutchfield kit for installing my car sound system. I bought my first Crutchfield car stereo (also a Pioneer) in the late 1970's. It was all done on the phone. Even back then Crutchfield knew what was needed for your car. I figure they still do, so whatever is in the recommended install kit I get it. [ Gary  Dec 16, 2015 ]
Necessary to ensure compatibility between new radio and factory wiring harness and equipment [ Andrew  Dec 05, 2015 ]

9 questions already asked

I did use it on a E46 model BMW,it work fine after it was install but it was a pain to make it fit on the BMW hopefully yi have moi room, gooo luck [ William  Jun 22, 2016 ]
If you tune the gains right, then maybe. I had a similar problem and buying higher resistance speakers did the trick. Also note that this thing is huge and will not fit behind most headunits. [ JORDAN  Apr 26, 2016 ]
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory controls. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you. [ Kenny  Mar 05, 2016 ]  Staff
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you. [ Jeff  Dec 01, 2015 ]  Staff
The Scosche SLC4 is a versatile adapter that allows for multiple applications. If your receiver doesn't have preamp outputs and you want to connect it to an amp that doesn't have speaker level inputs, this adapter can be used to convert you receiver's speaker level outputs into preamp outputs. With this adapter, you can hook either a 2-channel or 4-channel amplifier to your factory radio and not lose fader control. This adapter also allows you to add an aftermarket receiver to either a common ground audio system in your vehicle, or an audio system that has factory amplifiers (like many of the Premium, JBL, and Bose audio systems). There are gain controls for both the line outputs and the factory amp inputs. Which gain controls you use depends on your application. [ Larry  Oct 30, 2015 ]  Staff
I forwarded your question to an Advisor and they responded with the following: Please give an advisor a call at 888.955.6000 so we can identify your vehicle and the best way to integrate your amplifier into your vehicle. [ Krissy  Sep 16, 2015 ]  Staff
Yes [ GABRIEL P  Jul 06, 2015 ]
Each channel on this converter has an adjustment down inside. Use an eyeglass screwdriver flat head to adjust the level to an acceptable volume. I suggest turning all the levels all the way back then turning the volume up to the loudest you would ever use. At this point you can adjust the level to the loudest your speakers handle cleanly. [ CHAD E  Jul 05, 2015 ]
Where would I be able to online chat with them? [ Justin  Mar 05, 2014 ]
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you. [ Krissy  Mar 02, 2014 ]  Staff
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