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Rockford Fosgate RF-HLC4

4-channel line output converter

Item # 575RFHLC4

Ships free

Temporarily out of stock

Expected: 4/1/2019


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About the Rockford Fosgate RF-HLC4

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
  • MFR # RF-HLC4

What's in the box:

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

Customer reviews

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Rockford Fosgate RF-HLC4 Reviews

Average Customer Review(s):

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Crutchfield response

More details on the Rockford Fosgate RF-HLC4

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 10-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 Brown Not Used
4 Gray RF+
5 Gray/black RF-
6 Purple/black RR-
7 Purple RR+
8 Brown Not Used
9 White LF+
10 White/black LF-
Note:Connecting the Ground leads (brown) 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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Customer Q&A

Crutchfield asked: Why did you buy this?
I wanted to connect my old Kicker KX 700.5 to a Head unit that doesn't have RCA Pre-outs. If I use the Speaker Level Inputs of the amplifier it'll pickup alternator noises. It take care of the issue. Always trust in the Rockford Fosgate brand. [ JOSE  May 10, 2018 ]
RECOMMENDED [ KIM  Mar 21, 2018 ]
Size and brand reputation [ PEDRO  Mar 07, 2018 ]
I have a new Jeep and I want to keep the factory radio with the steering wheel controls and this will make adding an amp easy. [ Barry  Mar 02, 2018 ]
Didn't want too much ...just enough to get the job done, plus Rockford Fosgate is a very good brand. [ Glenn  Jan 10, 2018 ]
Quality and reviews. [ E  Sep 22, 2017 ]
My Installer [ Steven C/O Andrew  Aug 08, 2017 ]
It's what I needed. [ Robert  Apr 19, 2017 ]

3 questions already asked

Does this correct bass roll off?
[ Artifice  Sep 11, 2017 ]
1 answer
It does not, no. It just provides the high level to low level conversion.
[ Ryan  Sep 13, 2017 ]  Staff
I want to hook up 1800 watt amp and 2 12inchsubs in a box what converter do i need?
[ candy isaacks  Feb 25, 2014 ]
1 answer
For details on installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to give you the details on what you will need.
[ Krissy  Feb 26, 2014 ]  Staff
Does this converter has a Remote wire for your amps to turn off/on ? And can I used it for two amplifiers ??
[ Frank  Jan 14, 2014 ]
1 answer
No, the amp switch wire would not run through the converter. The switch wire(s) should be spliced directly to the switched 12v on the head unit. Using this for two amplifiers completely depends on your setup, and whether you want to amplify front and rear channels separately. Using a four channel amplifier combined with a separate mono amp for the sub? You can use this with two RCA "y" splitters put on either the front or rear channels. Two mono amps? Don't use this. Buy a two channel converter instead and split the signal on the RCA side.
[ Ryan  Jan 14, 2014 ]

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