Description
4-Channel High-to-Low Line Output Converter Front and Rear 10.5V Input, 3V RCA Output, 25 × 76 × 89mm. For Factory and Aftermarket Radios Without RCA Outputs.
Product Overview
The Rockford Fosgate RF-HLC4 is a 4-channel line output converter (LOC) the 4-channel counterpart to the RF-HLC. Where the RF-HLC provides 2-channel (stereo) conversion for a single amplifier, the RF-HLC4 provides separate front and rear channel outputs enabling front/rear fade control or connection to a 4-channel amplifier from a factory or aftermarket radio without RCA preout jacks.
The RF-HLC4 accepts separate front left/right and rear left/right high-level speaker inputs (each with their own ground lead), and outputs four RCA jacks (front left/right and rear left/right) at up to 3V. Input voltage: up to 10.5V. Behind-dash mounting. Warranty confirmed for authorised dealer purchases.
Key Specifications
- Part number: RF-HLC4
- Type: 4-channel line output converter (LOC) ✓
- Channels: 4 (Front L/R + Rear L/R stereo) ✓
- Input connections: Front L+/-, Front R+/-, Rear L+/-, Rear R+/-, Front ground, Rear ground ✓
- Input voltage: Up to 10.5V ✓
- Output connections: Front Left RCA, Front Right RCA, Rear Left RCA, Rear Right RCA ✓
- Output voltage: Up to 3V ✓
- Mounting: Behind the dash ✓
- Dimensions: 1" × 3" × 3-1/2" (25.4mm × 76.2mm × 88.9mm) ✓
- Warranty: Confirmed (authorised dealer purchase required — terms TBC)
Features & Benefits
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4-Channel — Front and Rear Independent Conversion Separate front and rear channel inputs and outputs allow independent signal paths for front and rear speaker zones — enabling fade control at the amplifier and the ability to connect front and rear amplifier channels independently.
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Separate Front and Rear Ground Leads Dedicated ground leads for the front and rear input circuits help minimise ground loop noise independently in each channel pair — reducing the risk of hum from shared ground paths.
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10.5V Input / 3V RCA Output Same voltage specifications as the RF-HLC — up to 10.5V high-level input, up to 3V RCA output. Suitable for factory OEM and aftermarket head units without RCA outputs.
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Behind-Dash Mounting — Compact LOC Footprint At 25.4 × 76.2 × 88.9mm, the RF-HLC4 is wider than the RF-HLC (25.4 × 39.7 × 88.9mm) to accommodate the additional 4-channel wiring, but maintains the same behind-dash mounting profile.
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Factory and Aftermarket Radio Compatible Suitable for both factory OEM and aftermarket head units without RCA preout jacks.
Technical Specs
| Specification |
Detail |
| Brand |
Rockford Fosgate |
| Part Number |
RF-HLC4 |
| Type |
4-Channel Line Output Converter (LOC) ✓ |
| Channels |
4 (Front L/R + Rear L/R) ✓ |
| Front Input |
L+/-, R+/- + Ground lead ✓ |
| Rear Input |
L+/-, R+/- + Ground lead ✓ |
| Input Voltage |
Up to 10.5V ✓ |
| Front Output |
Left RCA, Right RCA ✓ |
| Rear Output |
Left RCA, Right RCA ✓ |
| Output Voltage |
Up to 3V ✓ |
| Mounting |
Behind the dash ✓ |
| Dimensions |
25.4 × 76.2 × 88.9mm (1" × 3" × 3-1/2") ✓ |
| Warranty |
Confirmed (authorised dealer) — terms TBC |
Compatible With / Goes Well With
Suitable for:
- Factory and aftermarket radios without RCA preout jacks — 4-channel output
- 4-channel amplifiers requiring front and rear RCA inputs
- Systems requiring separate front/rear signal paths for fade control
Pairs well with:
- Rockford Fosgate RFI or RFIT series RCA cables (front and rear runs to amplifier)
- Any 4-channel amplifier with front and rear RCA inputs
Frequently Asked Questions
What is the difference between the RF-HLC4 and the RF-HLC?
Both are line output converters with identical 10.5V input and 3V output voltage specifications. The RF-HLC is 2-channel (stereo); the RF-HLC4 is 4-channel (front and rear stereo). Choose the RF-HLC4 when connecting to a 4-channel amplifier or when separate front and rear signal paths are required.
Why does the RF-HLC4 have two ground leads?
The RF-HLC4 has separate ground leads for the front and rear input circuits — reducing the risk of ground loop noise between the front and rear channel pairs, which can be introduced when both share a single ground reference.
Can the RF-HLC4 handle factory head unit output voltages?
Yes — the 10.5V input tolerance covers the range of most factory OEM head units (typically 2–8V at the speaker terminals) and aftermarket head units.
Is the RF-HLC4 covered by warranty?
Yes — Rockford Fosgate's warranty is confirmed active. Coverage requires purchase from an authorised dealer. Confirm the specific warranty period with your authorised reseller at time of purchase.
Do I need an RF-HLC4 if my amplifier already has high-level inputs?
If your amplifier already accepts high-level (speaker-level) inputs directly — such as the Rockford Fosgate TM750X1bd or TM1000X5ad — a separate LOC is not required. The RF-HLC4 is needed when the amplifier only accepts RCA inputs and the radio has no RCA outputs.
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