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Compact aluminium box with gold RCA sockets and a single volume knob

WUQ

WUQ Passive Preamp Volume Controller Hi-Fi Version

SKU CH-JJJR-367CF

Passive preamp with ALPS 50K potentiometer and gold-plated RCA connectors for lossless volume control

  • TypeOther
  • Lossless audio with no added gain or colouration
  • Smooth, precise volume control via ALPS A50K dual potentiometer
  • Signal clarity from gold-plated CMC-816U RCA terminals
  • Compact CNC-machined aluminium chassis fits any system
  • Passive design suits high-output sources and active amplifiers

Passive preamp for high-output sources

This passive preamplifier adds no gain and is built for HiFi PC sound cards, DACs, CD players, active speakers and pure power amplifiers that already deliver a high-level signal. The single RCA input and output pair keeps the signal path minimal. It suits listeners who want transparent volume control without added colouration or distortion.

ALPS A50K potentiometer gives smooth control

The dual 50 kΩ ALPS potentiometer operates without detents, providing continuous and precise volume adjustment under sustained listening sessions. Because the circuit is entirely passive, its behaviour does not change with temperature or extended use. There is no active stage to introduce noise or drift over time.

Gold-plated CMC-816U RCA terminals in aluminium

US-made CMC-816U connectors use oxygen-free copper plated with 24K gold to preserve signal clarity and resist corrosion. The CNC-machined aluminium alloy housing provides shielding and a compact footprint. With no power supply or active electronics, the unit draws no power and adds no audible noise or heat to the system.

Highlights

  • Lossless audio with no added gain or colouration
  • Smooth, precise volume control via ALPS A50K dual potentiometer
  • Signal clarity from gold-plated CMC-816U RCA terminals
  • Compact CNC-machined aluminium chassis fits any system
  • Passive design suits high-output sources and active amplifiers

Specifications

TypeOther

Questions about this item

Does the ALPS 50K potentiometer add any noise or heat during continuous use?

The passive design has no active circuitry, so the ALPS 50K potentiometer introduces no electrical noise or heat during all-day operation.

What source equipment must I already own to use this passive preamp?

You need a source with a high-level RCA output such as a PC sound card, DAC or CD player, plus an active speaker or power amplifier with its own gain.

Will the gold-plated CMC-816U RCA terminals work with my older RCA cables?

Yes, the 24K gold-plated CMC-816U connectors accept standard RCA plugs, so existing cables connect without adapters.

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