Rockford Fosgate RF-HLC4

4-channel line output converter

Item #: 575RFHLC4

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5 Reviews

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Small enough to fit behind your dash and never needs adjusting

When you want to add an amplifier to a car stereo that doesn't have RCA-type outputs, Rockford Fosgate's HLC4 4-channel line output converter may be the perfect solution. The HLC4 converts the high-level signal from your receiver's speaker-level outputs down to low-level signals that your amp can handle. This compact converter will fit just about anywhere.

Product Highlights:

  • 4-channel line output converter
  • input: up to 10.5-volt (about 27 watts)
  • output: up to 3 volts
  • includes ground leads to reduce noise if necessary
  • dimensions: 4-15/16"W x 1-1/16"H x 3-1/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

Rockford Fosgate RF-HLC4 Reviews

Average Customer Review:

5 reviews
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Great product

Written By Miket2573, Florida on Sunday, October 04, 2015

Crutchfield Customer Review (What's this?)

Great product works great

Pros: Line level works just like it was advertised

Cons: None

Rockford Fosgate RF-HLC4

Written By Anonymous, Jackson, MO on Friday, March 27, 2015

Crutchfield Customer Review (What's this?)

It does the job...had I done a little more research I would have went with something different like a plug and go that has built in remote wire

Pros: Does work well

Cons: No remote wire

rockford rf-hlc4

Written By jp, reno,nv on Sunday, May 25, 2014

Crutchfield Customer Review (What's this?)

got this to hook up factory stereo with 5 channel amp for new speakers and sub. worked very well. ran jumper from rear speakers to sub, adjust gain, adjust fade works very well. would recommend this as a very cheap and easy way to amp your factory radio

Pros: works good, inexpensive, easy to hook up

Cons: none so far

Great product

Written By Anonymous, oklahoma on Sunday, February 23, 2014

Crutchfield Customer Review (What's this?)

This product was great. It was used to replace a cheap converter bought at walmart that produced a annlying gain tone. The ground cable and insulation took that tone away.

Pros: Great quality Ground cable Well protected

Cons: Large and in the way

Does what it needs to do.

Written By RB, Houston Tx on Sunday, December 29, 2013

Crutchfield Customer Review (What's this?)

I used this to connect a scion factory HU to a Kenwood 5 channel amp. Combining this with properly tuned gain settings on the amp, there is absolutely no distortion with the HU at max volume. I can't keep it there for long, though, for fear of hemorrhaged ears. The separate harness makes it easy to splice into the factory lines for a butterfingers like me. My only gripe is that the output levels are not adjustable. I learned the hard way that my head unit outputs the rear channels at a much lower voltage than the front - something that I was fortunately able to compensate for using the amp gain switches.

Pros: Quality, ease of installation.

Cons: Lack of adjustable outputs

Hands-on research

What's in the box?

Download owner's manual

  • 4-Channel high-level to low-level signal converter
  • 12" Speaker-level harness
  • Instructions on packaging

Product Research


4-Channel High-Level to Low-Level Converter: The Rockford Fosgate RF-HLC4 is a 4-channel high-level to low-level signal converter designed for factory or aftermarket radios that do not have dedicated low-level RCA outputs. The adapter converts high-level signal from the radio's speaker line and transforms it into a safer low-level audio signal. This allows you to add a 4-channel amplifier to your system for higher power output and better sound quality.

Speaker Level Input: The Rockford Fosgate RF-HLC4 comes with a 9-wire speaker-level harness which plugs into the converter's 10-pin connector. The speaker-level harness will need to be spliced or crimped onto your head unit's wiring harness (splicing and crimping accessories sold separately). The RF-HLC4 has an input voltage of up to 10.5V.

Pin # Wire Color Function
1 Green/black LR-
2 Green LR+
3 Open (none)
4 Gray RF+
5 Gray/black RF-
6 Purple/black RR-
7 Purple RR+
8 Black Ground
9 White LF+
10 White/black LF-
Note:Connecting the Ground lead (black) is not necessary unless there is noise in the audio system.

Low Level Output: The Rockford Fosgate RF-HLC4 is fitted with 4 RCA jacks (Front Left/Right, Rear Left/Right). These RCA jacks connect to your aftermarket amplifier via stereo RCA cables (sold separately). The RF-HLC4 has an output voltage of up to 3V.

Mounting Options: The 4-channel high-level to low-level signal converter should be installed behind the vehicle's dash and car stereo.

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