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Compact black metal box with multiple RCA ports and adjustment knobs

METRA

METRA Proscenium PR-LOC2.4-PRO 2 In/4 Out Active Line Output Converter

SKU CH-S80W-4HCBB

Active line output converter converts two OEM speaker-level inputs into four pre-amp outputs with 0 dB to +12 dB bass boost on rear channels

  • Key features4-channel: 2 in, 4 out
  • 4-channel active converter expands factory audio to four amplifier outputs
  • 40V maximum input handles high-power OEM head units without distortion
  • Bass boost adds up to 12dB on rear channels for stronger low-end
  • Selectable input impedance (20, 60, 20k Ohm) and ground modes (GND, ISO, 200 Ohm) eliminate noise
  • Signal-to-noise ratio exceeds 110dB at 6.4V output for clean sound

What This Converter Does

The METRA Proscenium PR-LOC2.4-PRO is an active line output converter that accepts two channels from a factory head unit and delivers four channels to aftermarket amplifiers. It handles speaker-level signals up to 40V or 400W at 20k Ohm, making it suitable for high-power OEM audio systems that need clean pre-amp outputs.

Installation Notes

The unit operates on 9V to 16V and offers trigger selection via REM, DC, or audio detection with a 3V to 7V DC turn-on threshold. Input impedance can be set to 20, 60, or 20k Ohm, and ground selection provides GND, ISO, or 200 Ohm options. Independent front and rear gain adjustment ranges from –28dB to +1dB for precise level matching.

Capacity And Limits

Bass boost on the rear channels is adjustable from 0dB to +12dB with a low-pass filter below 250Hz. Maximum output reaches 9.5V RMS at 13.8V supply, with signal-to-noise ratio exceeding 110dB at 6.4V output and frequency response covering 20Hz to 20kHz. Input sensitivity spans 0.5V to 20V, and the remote output is rated at 500mA.

How it compares

Measured against everything we stock in Car Stereos & Multimedia Receivers, at today’s prices. Recalculated every night.

Price $64.99
Cheaper than about 89% of the 3,253 comparable items (median $212.99).

Specifications

Product
Brand nameProscenium

Questions about this item

How can I confirm the PR-LOC2.4-PRO is working correctly after installation?

Verify the clip indicator stays off while music plays, then check each of the four RCA outputs with a multimeter for clean signal up to 9.5 V RMS at 13.8 V supply.

What comes in the box and what must I purchase separately?

The converter includes the main 2-in/4-out unit with gain controls, bass boost, low-pass filter, load selector and trigger options; the optional PR-RM-1 remote module is sold separately.

Which input-impedance setting should I choose for my factory head unit?

Select 20 kΩ for most OEM radios, 60 Ω if the source expects a speaker-level load, or 20 Ω for very low-impedance outputs — match the setting to the head unit’s specification.

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