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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What’s in the box? | In-depth notes

Product Research

What's in the box?

Line output adapter with attached plastic screwdriver
Instructions

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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.

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5 out of 5

Great Product

Written By Chris S, Baltimore, MD on Tuesday, November 22, 2011

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.