Rockford Fosgate RF-HLC4 4-Channel High-to-Low Converter

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.

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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.

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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)

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Features & Benefits

• 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.
• 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.
• 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.
• 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.
• Factory and Aftermarket Radio Compatible Suitable for both factory OEM and aftermarket head units without RCA preout jacks.

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Technical Specs

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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

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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.