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Black rectangular converter with silver front panel, four input and output RCA jacks, gain knobs and indicator LEDs

METRA

METRA Proscenium PR-LOC4.4-PRO 4-Channel Active Line Output Converter

SKU CH-NQCX-5DASA

Converts speaker-level signals to four RCA outputs with up to 40V input, rear-channel bass boost up to 12dB and independent gain control

  • Key features4-channel: 4 in, 4 out
  • 4-channel active LOC adds amplifiers to factory stereos with 4 in, 4 out design
  • Handles up to 40V or 400W speaker-level signals without distortion
  • Bass boost adjustable 0 to 12dB on rear channels for deeper low-end
  • Selectable input impedance 20, 60 or 20k Ohm matches any OEM source
  • Signal-to-noise ratio exceeds 110dB at 6.4V output for clean audio

4-Channel Active LOC

The METRA Proscenium PR-LOC4.4-PRO is a 4-channel active line output converter designed for installers adding aftermarket amplifiers to OEM source units. It accepts four input channels and provides four output channels for enhanced sound quality. Universal application support allows integration with a variety of factory audio systems. The unit operates on a 9V to 16V supply voltage range.

Bass Boost and Filter Controls

Rear channels feature a selectable bass boost from 0dB to 12dB alongside a low pass filter set below 250Hz. Independent front and rear gain adjustment spans from -28dB to +1dB for precise signal matching. Input impedance can be switched between 20, 60, and 20k Ohm settings. Ground selection offers GND, ISO, and 200 Ohm options to combat noise. Trigger selection supports REM, DC, and AUDIO modes with a 500mA remote output rating.

40V Input and Signal Performance

Maximum input level reaches 40V or 400W at 20k Ohm, providing high headroom for powerful factory amplifiers. Output maxes at 9.5V RMS at 13.8V operating voltage. Input sensitivity ranges from 0.5V to 20V. Signal-to-noise ratio exceeds 110dB at 6.4V output with a frequency response of 20Hz to 20kHz. Turn-on trigger activates between 3V and 7V DC. Builders needing more than four channels or digital signal processing should consider other solutions.

How it compares

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

Price $71.99
Cheaper than about 87% of the 3,253 comparable items (median $212.99).

Specifications

Product
Brand nameProscenium

Questions about this item

What input impedance setting should I check or change if the factory head unit starts to clip?

The converter offers 20, 60, or 20k Ohm input impedance selections; choose the one that matches your OEM source to prevent clipping.

At what output voltage does the clip indicator activate during extended play?

The clip indicator monitors the 9.5 V RMS maximum output at 13.8 V supply, lighting when the signal approaches that limit.

How much current does the remote turn-on lead draw when the system runs all day?

The remote output is rated at 500 mA, so the turn-on circuit draws up to half an amp continuously.

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