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Scosche SLC4 Line Output Converter

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

Item # 142SLC4

So you're trying to connect an amplifier without speaker-level inputs to a car stereo that doesn't have preamp...

Find what Fits your car

So you're trying to connect an amplifier without speaker-level inputs to a car stereo that doesn't have preamp...

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Item # 142SLC4

In stock
C$21.99

About the Scosche SLC4 Line Output Converter

Scosche SLC4 Line Output Converter

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

Scosche SLC4 Line Output Converter

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

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

The SLC4 features adjustable gain settings on each channel, and it's compatible with any car stereo. Dimensions: 4-7/8"W x 1-3/16"H x 2-3/4"D. Warranty: 90 days.

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What's in the box:

  • Line output adapter with attached plastic screwdriver
  • Instructions
MFR #SLC4

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Scosche SLC4 Line Output Converter reviews

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More details on the Scosche SLC4 Line Output Converter

Stacey B.

Product Research

Features

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

Note: There is a plastic screwdriver that is physically attached to the adapter, and must be broken off to use. It is used to adjust gain controls and screw down the speaker terminals.

Speaker-Level-to-Line Level Conversion: The adapter can convert car stereo speaker outputs to RCA outputs so an external 2 or 4 channel amplifier can be added to a car audio system. There are line output controls that allow you to adjust the output level going into your amplifier(s). The adapter can handle up to 50 watts (RMS) / 100 watts (Peak) 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.

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Customer Q&A

21 questions already asked

Q
Will this eliminate the use of a remote wire?
[ Jason  Jun 07, 2020 ]
2 answers
A
Hi Jason - I don't know what a remote wire is. This device is designed to take amplified speaker level output and reduce it down to line level so that you can connect your head unit to an external amplifier. I hope this helps. Good luck with your installation. - Jon
[ Jonathan  Jun 07, 2020 ]
A
No. This does send a power signal to the amp. If you're interested in that technology I suggest the AudioControl LC2i
[ Edwin  Jun 07, 2020 ]
Q
Can this be used for a common ground output on an older radio(ie: Sony Xr2100), then using the rca line outs for output signal to an amp?
[ Zach  Apr 15, 2020 ]
2 answers
A
This is not for that purpose, no. you should reach out to an advisor for more personalized help! https://www.crutchfield.com/support/ContactUs.aspx
[ Calvin  May 06, 2020 ]  Staff
A
Not for common ground.
[ Alondra  May 02, 2020 ]
Q
Can I hook up a scosche ta03b and my pioneer fh-s500bt to my jbl factory amp without a factory harness kit?
[ Patrick  May 17, 2019 ]
1 answer
A
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.
[ Krissy  May 28, 2019 ]  Staff
Q
What I s the black wire that comes out the side hook to ?
[ Shorty  Feb 21, 2018 ]
4 answers
A
Amp trigger wire.Wire is usually and dark blue wire for most car manufacturers. I would be sure to get a wiring diagram for the radio to see what color the wire is if it has one. If not you can hook it up to constant 12v
[ Christopher  Feb 21, 2018 ]
A
ground
[ RAY  Feb 21, 2018 ]
A
I bypassed this whole unit as it wasn't necessary.
[ Michael  Feb 21, 2018 ]
A
Ground wire
[ stephen  Feb 21, 2018 ]
Q
What is the black wire that comes out the side hook to ?
[ Shorty  Feb 21, 2018 ]
1 answer
A
Ground. Reduces RF signal interference.
[ Matthew  Feb 28, 2018 ]
Q
This is coming in my installation kit for my Toyota Highlander install, has a JBL amp...question is this, does this go up with the receiver, or back with the amp?
[ Tim  Sep 18, 2017 ]
1 answer
A
Thanks for your question. This will be installed by the receiver for the wiring harness. If you need any help with the connections, feel free to contact our Tech Support team. They can walk you through everything. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website.
[ Kenny  Sep 19, 2017 ]  Staff
Q
I have a trouble with this converter in my VW CC with Dynaudio factory soundsystem. Converter works during some time (10sec...2mins), but after that it stop working until I will switch mode from AMP to LINE and back. In what could be the problem ? https://youtu.be/XVLMd00mpEM
[ Vitalii  Aug 14, 2017 ]
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer, or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
[ Kenny  Aug 14, 2017 ]  Staff
Q
My newly installed aftermarket head unit on my 2005 Pontiac vibe is way too loud. Volume 0 sounds more like volume 5 and includes a constant static. Am I right to assume I can connect this between the vehicles harness and my head unit harness to lower the gain from the factory amp?
[ Sam P  May 27, 2017 ]
1 answer
A
Tech Support is included with your purchase from Crutchfield, feel free to contact our Tech Support team. They can walk you through the connections to see if this may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website.
[ Kenny  May 27, 2017 ]  Staff
Q
2007 350z with bose and this little thing is part of a sony xav-w650bt package, do i need it if either 1) im just replacing the head unit, or 2) im replacing all the speakers and using a 4 or 5 channel amp?
[ richard  Jun 22, 2016 ]
1 answer
A
I did use it on a E46 model BMW,it work fine after it was install but it was a pain to make it fit on the BMW hopefully yi have moi room, gooo luck
[ William  Jun 22, 2016 ]
Q
Will this eliminate the amp popping on my 92 Lincoln town car with factory JBL amps and aftermarket head unit?
[ Cletus  Apr 26, 2016 ]
1 answer
A
If you tune the gains right, then maybe. I had a similar problem and buying higher resistance speakers did the trick. Also note that this thing is huge and will not fit behind most headunits.
[ JORDAN  Apr 26, 2016 ]
Q
Will this work in a 2001 mercury sable with electronic climate controls?
[ Laz523  Mar 05, 2016 ]
1 answer
A
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory controls. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.
[ Kenny  Mar 05, 2016 ]  Staff
Q
02 acura mdx comes with bose amp do I need this one if I want to use and aftermarket player? does it going to sound better if I use the bose amp with this SLC4 or is it better if I use only the cd player straight to my speakers ?
[ Juan  Nov 29, 2015 ]
2 answers
A
You should have an onboard amp. You won't need this. Just wire directly where your factory head unit went.
[ Michael  Feb 21, 2018 ]
A
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.
[ Jeff  Dec 01, 2015 ]  Staff
Q
I AM INSTALLING THIS ON MY 2007 HARLEY. IT IS A 2 OHM LINE IN AND THE REST OF MY AUDIO IS 4 OHM. IT MY UNDERSTANDING THAT THIS WILL FIX MY LOSS OF SIGNAL? I ALREADY BOUGHT THIS BUT HAVENT INSTALLED IT YET DID I GET THE RIGHT THING?
[ James  Oct 27, 2015 ]
1 answer
A
The Scosche SLC4 is a versatile adapter that allows for multiple applications. If your receiver doesn't have preamp outputs and you want to connect it to an amp that doesn't have speaker level inputs, this adapter can be used to convert you receiver's speaker level outputs into preamp outputs. With this adapter, you can hook either a 2-channel or 4-channel amplifier to your factory radio and not lose fader control. This adapter also allows you to add an aftermarket receiver to either a common ground audio system in your vehicle, or an audio system that has factory amplifiers (like many of the Premium, JBL, and Bose audio systems). There are gain controls for both the line outputs and the factory amp inputs. Which gain controls you use depends on your application.
[ Larry  Oct 30, 2015 ]  Staff
Q
Can I use this line out converter and power both rca from only the rear speaker input to signal a 4 channel amp . I have a dm 8604 with rca jacks but it gives a popping noise so wanted to install a loc to see if it does the trick ?
[ Suleman  Sep 11, 2015 ]
1 answer
A
I forwarded your question to an Advisor and they responded with the following: Please give an advisor a call at 888.955.6000 so we can identify your vehicle and the best way to integrate your amplifier into your vehicle.
[ Krissy  Sep 16, 2015 ]  Staff
Q
I have a pioneer avh-4100nex in my 2010 camaro that has a factory amp. right now, the schosche install kit has the speaker level outputs from the pioneer going to the factory amp, and is too loud. Will this allow me to use the rca preamp outputs on the pioneer instead?
[ JAMES  Jul 04, 2015 ]
2 answers
A
Yes
[ GABRIEL P  Jul 06, 2015 ]
A
Each channel on this converter has an adjustment down inside. Use an eyeglass screwdriver flat head to adjust the level to an acceptable volume. I suggest turning all the levels all the way back then turning the volume up to the loudest you would ever use. At this point you can adjust the level to the loudest your speakers handle cleanly.
[ CHAD E  Jul 05, 2015 ]
Q
My mom has a 97 firebird trans am convertable and she wants to keep her stock radio. Can she do this if she wants subs? And where would this be put in the car?
[ Justin  Mar 02, 2014 ]
2 answers
A
Where would I be able to online chat with them?
[ Justin  Mar 05, 2014 ]
A
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.
[ Krissy  Mar 02, 2014 ]  Staff
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