Scosche SLC4 Line Output Converter

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

Item #: 142SLC4

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82 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, then check here for a list of parts. You can also call an Advisor for more information.

Hands-on research

What's in the box?

Download owner's manual

  • Line output adapter with attached plastic screwdriver
  • Instructions

Product Research


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.

Scosche SLC4 Line Output Converter Reviews

Average Customer Review:

82 reviews
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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 was easy.

Works like a charm just need to know what your doing

Written By carlos, Panorama City, CA on Saturday, 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!

Waste of money

Written By CraigE, Portland, OR on Monday, 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.


Written By My_Fast, Philadelphia, PA on Monday, 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.

Scosche SLC4 Line Output Converter

Written By Anonymous, Columbus, OH on Monday, 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.

Crutchfield should offer a better LOC

Written By David, OR on Monday, 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

Great Product

Written By BumpinResponsibly, Pittsburgh, PA on Tuesday, December 08, 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.

Good unit

Written By Evan, Cleveland, oh on Friday, 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.


Written By haccord1024, wisco on Saturday, July 04, 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!

Scosche SLC4 Line Output Converter

Written By Bret, Valrico, FL on Tuesday, April 07, 2009

Crutchfield Customer Review (What's this?)

Good converter, works for the application I needed. Simple to install no problems.

Great service from Crutchfield.

Scosche SLC4 Line Output Converter

Written By RRRRyyaann, Port St Lucie on Thursday, 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!!


Written By no, mt.jackson,va. on Saturday, 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.

Scosche SLC4 Line Output Converter

Written By John, Mechanicsville, VA on Sunday, March 15, 2009

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.

Scosche SLC4 Line Output Converter

Written By josh b, Montgomery, AL on Monday, February 09, 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

It's okay but be careful

Written By Gary, Southern California on Friday, January 02, 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...

Scosche SLC4 Line Output Converter

Written By allen, middle on no where wv on Friday, 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.


Written By Marc, Alpharetta, GA on Monday, October 06, 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!

Scosche makes better power cables.....

Written By micah, Memphis TN on Friday, 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.

Scosche SLC4 Line Output Converter

Written By Reagan, San Antonio, TX on Saturday, August 09, 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.

great product

Written By alexander, new jersey on Sunday, 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!

Scosche SLC4 Line Output Converter

Written By Kevin, Seattle, WA on Sunday, 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.

Great Product For Adding An Amp 2 Factory System!!

Written By kevycan, Conway, SC on Sunday, 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!

Scosche SLC4 Line Output Converter

Written By Jeff, Harrisonburg, Va on Monday, 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!

Gets the job done

Written By Jeffrey, Austin, TX on Sunday, April 29, 2007

Crutchfield Customer Review (What's this?)

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

Scosche SLC4 Line Output Converter

Written By Bobby, N. Fort Myers on Wednesday, 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)
I didnt have any excess noise either.
Well worth $20

Scosche SLC4 Line Output Converter

Written By indign, ct on Sunday, April 08, 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.
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.
Also there is no way to mount it so you have to get creative.

Finding the missing link!

Written By Jason, Reno, Nv. on Wednesday, 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!

great item, it worked for me.

Written By mgramlng, Memphis, TN on Friday, September 08, 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...

Decent for Price

Written By Zack, Pass Christian, MS on Tuesday, 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.

Pros: Three settings, Adjustable levels, good instruction manual, groundable, looks decent.

Cons: A bit flimsy, not high quality material.

Buy it now!

Written By Eric, Mililani, Hawaii on Thursday, 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!

[Editor's Note: According to Crutchfield's Product Research team, 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.]

Get everything you’ll need to enjoy your new Scosche SLC4 Line Output Converter

Patch cables bring the audio into your aftermarket amplifier.
A little extra speaker wire may make placement of your new adapter simpler.
T-Spec 2-Channel RCA Patch Cables

T-Spec 2-Channel RCA Patch Cables

Available in 7 different lengths (10-foot)

Item #: 120RCA102


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T-Spec 4-Channel RCA Patch Cable

T-Spec 4-Channel RCA Patch Cable

17-foot length

Item #: 120RCA174


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EFX 17-foot RCA Patch Cable

EFX 17-foot RCA Patch Cable

Item #: 142A17C


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EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Reference Series Multi-Core RCA patch cables — available in 5 different lengths (12-foot)

Item #: 142RR12


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EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Core Series Twisted RCA patch cables — available in 5 different lengths (12-foot)

Item #: 142RCT12B


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EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Elite Series Braided Multi-Core RCA patch cables — available in 5 different lengths (25-foot)

Item #: 142RE25

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Pro.Fit Hook Tool Set

Pro.Fit Hook Tool Set

Installation tools — pair

Item #: 042DM3022


Pro.Fit Trim Panel Tool

Pro.Fit Trim Panel Tool

Remove your vehicle's trim panels without damage

Item #: 042DM4022


Pro.Fit Wire Worm

Pro.Fit Wire Worm

Installation tool helps route wiring through tight spaces

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Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 3 pry tools — helps remove interior and exterior trim and door panels

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Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

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Spec Tools Stubby Driver

Spec Tools Stubby Driver

Ratcheting driver for tight installations

Item #: 180PGS5100


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Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

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Spec Tools SQR-200a Squeeze Wrench

Spec Tools SQR-200a Squeeze Wrench

Narrow space ratchet kit with 18 sockets

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S&G Tool Aid 87615

Window and Door Clip Removal Tool

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Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

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S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

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Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

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Install Bay 3320

Install Bay 3320

Auto-ranging digital multimeter

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Install Bay IB35400

Install Bay IB35400

Premium door panel and trim tool

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Posi-Products™ Car Stereo Connectors

Posi-Products™ Car Stereo Connectors

16 connectors for installing a new car stereo

Item #: 669PP500


Posi-Products™ Car Speaker Connectors

Posi-Products™ Car Speaker Connectors

8 connectors for installing car speakers

Item #: 669PP502


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Posi-Products™ Wire Connectors