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Scosche SLC4

Four-channel line output converter

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  • Scosche SLC4

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  • Scosche SLC4
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Item# 142SLC4 offer details

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Scosche

Our take on the Scosche SLC4

by Tim Sprinkle

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.

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Hands-on research from the Crutchfield Labs (what are the Labs?)

What’s in the box? | In-depth notes

Product Research

Product Research
What's in the box?

  • Line output adapter with attached plastic screwdriver
  • Instructions

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 open the box, verify contents, 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.

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.

 

Product Reviews

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Reviews for the Scosche SLC4

Average Customer Review:

42 people say:

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5 out of 5

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
Was this review helpful?    Yes | No
 
5 out of 5

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.
Was this review helpful?    Yes | No
 
5 out of 5

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.
Was this review helpful?    Yes | No
 
4 out of 5

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.
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4 out of 5

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 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
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4 out of 5

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.
Was this review helpful?    Yes | No
 
5 out of 5

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.
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5 out of 5

MADE LIFE SIMPLE AGAIN

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++
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3 out of 5

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.
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4 out of 5

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.
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5 out of 5

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
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4 out of 5

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.
Was this review helpful?    Yes | No
 
2 out of 5

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.
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5 out of 5

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!
1 out of 1 people found this helpful
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1 out of 5

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.
4 out of 5 people found this helpful
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2 out of 5

Eh

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.
1 out of 3 people found this helpful
Was this review helpful?    Yes | No
 
4 out of 5

Scosche SLC4

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.
1 out of 1 people found this helpful
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2 out of 5

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
3 out of 4 people found this helpful
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4 out of 5

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.
1 out of 2 people found this helpful
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3 out of 5

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.
2 out of 2 people found this helpful
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1-20 of 42 >>

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Rated 5-stars by consumers

For a more in-depth review and enhanced detailed information on the Scosche SLC4, please visit the Crutchfield website product page (/S-llatKMPz0qf/p_142SLC4/Scosche-SLC4.html ).

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    Scosche SLC4