Scosche SLC4 Line Output Converter

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

Item #: 142SLC4

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107 Reviews

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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.

Scosche SLC4 Line Output Converter Reviews

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Not needed

Written By Max, Alabama on Thursday, October 15, 2015

Crutchfield Customer Review (What's this?)

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

Crutchfield response on Monday, 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.


Written By Syd, Milford, CT on Tuesday, October 06, 2015

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, Missouri on Sunday, October 04, 2015

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, Minnesota on Monday, September 28, 2015

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, Georgia on Thursday, September 24, 2015

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, Buffalo on Sunday, September 13, 2015

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, Indiana on Thursday, September 10, 2015

Crutchfield Customer Review (What's this?)

Great product. installed it my self with ease.

Cons: none

Good product

Written By Matt, Toronto, Ontario on Monday, September 07, 2015

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, New York on Sunday, August 30, 2015

Crutchfield Customer Review (What's this?)


Hard to control or change adjustments

Written By ujjwalm, fairfax,va on Wednesday, August 26, 2015

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, Rogers City, MI. on Monday, August 03, 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.

Does the job

Written By PhilH, New York on Monday, July 13, 2015

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.


Written By Kevin, Houston Tx on Monday, July 06, 2015

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.

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

Didn't know I needed it, Crutchfield did

Written By da, Florida on Wednesday, June 24, 2015

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, California on Sunday, 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, Kansas City, Mo on Sunday, June 21, 2015

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.


Written By DaleC, Pennsylvania on Tuesday, June 02, 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, Virginia on Tuesday, May 26, 2015

Crutchfield Customer Review (What's this?)

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

Scosche SLC4 Line Output Converter

Written By Anonymous, Azalea, OR on Monday, May 11, 2015

Crutchfield Customer Review (What's this?)

Great price and worked great.

good product

Written By BMAC, Utah on Thursday, May 07, 2015

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.

Cons: none

Versatile, does the job

Written By Alex, Illinois on Thursday, April 30, 2015

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, Colorado Spgs, CO on Wednesday, April 29, 2015

Crutchfield Customer Review (What's this?)

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

Scosche SLC4 Line Output Converter

Written By Adrian G., Jamaica, NY on Sunday, 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.

Willing to sacrifice audio quality?

Written By DenCon, Ellensburg, WA on Sunday, April 12, 2015

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, Florida on Wednesday, April 01, 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.


Written By Anonymous, Leesburg, NJ on Sunday, March 22, 2015

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.


Written By Shane, Florida on Tuesday, March 17, 2015

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, Oregon on Sunday, March 08, 2015

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, Mechanicsville, va on Tuesday, March 03, 2015

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


Written By DR, eldersburg, maryland on Thursday, 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, Beavercreek, Ohio on Sunday, December 07, 2014

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

Confusing manual

Written By Madkins, Omaha NE on Tuesday, 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, north carolina on Sunday, November 16, 2014

Crutchfield Customer Review (What's this?)


Pros: easy

Works great

Written By J, Clanton, AL on Wednesday, October 08, 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, anywhere Georgia on Thursday, October 02, 2014

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 Monday, 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.


Written By FS, Navarre, FL on Sunday, September 14, 2014

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, Saugus MA on Tuesday, 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, ca on Monday, July 14, 2014

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.


Written By mBrane, US on Saturday, June 28, 2014

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 Tuesday, July 08, 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, Schaumburg, IL on Saturday, June 21, 2014

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., Bothell, WA on Friday, May 23, 2014

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, Denver, CO on Tuesday, May 13, 2014

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, Ann Arbor, MI on Tuesday, May 13, 2014

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.


Written By Anonymous, Kissimmee, Florida on Monday, April 28, 2014

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, Louisville, CO on Sunday, 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, Logan, UT on Sunday, April 13, 2014

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.

Didn't end up needing it

Written By Shawn, Albuquerque on Saturday, April 12, 2014

Crutchfield Customer Review (What's this?)

Didn't end up needing it

Not impressed

Written By Sir Yarquest, Springfield, MO on Monday, April 07, 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, Warminster, PA on Saturday, March 29, 2014

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, Chestertown, MD on Saturday, 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, San Juan, PR on Monday, March 17, 2014

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.


Written By smb, Charlottesville, VA on Thursday, March 06, 2014

Does what it needs to do

Worked Perfectly

Written By Chris, Atlanta, GA on Wednesday, 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, mesa,az on Monday, February 03, 2014

Crutchfield Customer Review (What's this?)

Did what it was intended to do

Pros: liked the screws to tighten down the wires

Scosche SLC4 Line Output Converter

Written By Anonymous, Lookout Mtn., GA on Saturday, January 18, 2014

Crutchfield Customer Review (What's this?)

good product

Adapter for Factory Power Amp

Written By RichW, North Carolina on Sunday, December 29, 2013

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, Houston, TX on Thursday, 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.


Written By WG, Plainview NY on Saturday, November 09, 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.

So easy a first-grader can do it

Written By Nate, San Diego, CA on Monday, 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, beeville tx on Monday, September 30, 2013

Crutchfield Customer Review (What's this?)

works just fine

Scosche SLC4 Line Output Converter

Written By Anonymous, Highland, CA on Saturday, September 07, 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, Naples, FL on Monday, August 05, 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, Westwood, NJ on Wednesday, 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, Cincinnati, OH on Thursday, 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, Fresno, TX on Monday, June 10, 2013

Crutchfield Customer Review (What's this?)

worked fine for what i needed.

Scosch SLC 4 on 2011 Ford F 150

Written By Jesse M, Kyle, TX on Sunday, 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, Mechanicsburg. PA on Friday, 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, Los Angeles on Saturday, 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, Texas on Friday, October 05, 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, Hartford, CT on Monday, 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 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, DC on Saturday, 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, Baltimore, MD on Tuesday, 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.


Written By Z28guy, Munroe Falls, Ohio on Wednesday, 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++

Hard to conceal

Written By Anonymous, St Pete FL on Saturday, July 23, 2011

Crutchfield Customer Review (What's this?)

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

Works Great

Written By Buck, Michigan on Saturday, 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.

Fixed the volume

Written By Tim, Vermilion Ohio on Tuesday, 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

It does the job

Written By BartK, Bolingbrook, IL on Tuesday, 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.

No good

Written By Cincinnati Marine, Cincinnati on Wednesday, January 05, 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 wa