The Pre Box RS is a reference-grade 2-channel preamplifier featuring a fully balanced dual-mono design with a vacuum tube based output stage. The circuit design is both ultra quiet and highly linear using no global negative feedback. Operating in pure Class A the Pre Box RS Analog is capable of producing stunning musical realism from any line level source. There are numerous source connectivity options using either two pairs of balanced XLR’s or the three pairs of single-ended RCA jacks. High-quality component parts are used throughout including low ESR capacitors, rugged relays, reliable dip-switches and a motor driven Alps potentiometer to control output level. All circuitry is encased in a heavy and rigid aluminum chassis that is mechanically constructed using anti-microphonic techniques. A robust highly regulated and filtered outboard power supply delivers ample voltage for impressive dynamic capabilities and in the near future an upgraded power supply will be available as an option. An IR remote control is supplied.

Additional information
Weight 1.95 kg
Dimensions 21 × 20.6 × 7.2 cm



  • Fully balanced double mono design
  • Ultra-linear and ultra low noise
  • Pure Class A circuitry
  • Input switching via relay
  • Low ESR capacitors
  • Blue Alps volume control
  • 3 XLR & 3 RCA inputs
  • 1 Pre–out XLR & 1 Record-out RCA
  • DC power supply (< 1 watt standby power)
  • IR remote control included
  • Metal casing protects against vibration and interference
  • Available in black and silver
  • Handmade in Europe


  • Tubes: 2 x ECC88 (6922)
  • Frequency response: 20Hz – 50kHz (0dB/-0,8dB)
  • Noise floor: 95dB (A weighted)
  • THD: 0,06%
  • Gain XLR and RCA* outputs: XLR 12dB / RCA 6dB for input 1 and input 4, XLR 6dB / RCA 0dB for inputs 2 & 3 and inputs 5 & 6
  • Pre out: 1 pair XLR sockets (balanced connection)
  • Record out: RCA input 1, gain: -6dB
  • Gain ratio input / output signal: RCA inputs 2 & 3, gain 0dB
  • Fixed output signal: XLR input 4 – gain: -6dB, XLR inputs 5 & 6 – gain: 0dB
  • Line-level inputs: 3 pair RCA sockets and 3 pair XLR
  • Input impedance: 150kohms for RCA input 1 and XLR input 4, 30kohms for RCA inputs 2 & 3 and XLR inputs 5 & 6
  • Wiring XLR sockets: 1 ground, 2 “hot” and 3 “cold”
  • Outboard power supply: 20V/3A DC, suitable for your country’s mains supply
  • Power consumption: 700mA DC, <1W in standby
  • Replacement battery remote control: 1 x CR2032 / 3V or 1 x CR2025 / 3V

*Unbalanced connection via supplied connection cable (XLR > RCA).

You may also like…

Privacy Preference Center