Amp Box RS Mono from Pro-Ject offers 3-dimensional soundstaging loaded with micro-detail and with audiophile-caliber resolution. At 120/180WPC 8/4ohms respectively, it’s a great option for monoblocking (each speaker in a stereo pair being powered by its own, single-channel amp). Features include a high-quality tube buffer stage, SMD construction for the shortest possible signal paths and top-notch RCA/XLR ins/outs & speaker binding posts to preserve signal integrity. Amp Box RS Mono is a simple, affordable and high-end piece of electronics that’ll properly introduce you to the world of separates.

Additional information
Weight 1.89 kg
Dimensions 22 × 20.6 × 7.2 cm



  • Highly efficient conversion from mains to output power (92%)
  • 2 ohms drive capability
  • Tube buffer stage with reference quality
  • SMD construction for shortest signal paths
  • Line level preamp inputs (RCA & XLR)
  • Top-quality speaker terminals
  • Metal casing protects against vibration and interference
  • DC power supply (< 1 Watt standby power)
  • Available in silver or black
  • Handmade in Europe


  • Tubes: 1 x ECC88 (6922)
  • Power output: 120W/180W at 8 ohms/4 ohms
  • Frequency response: 20Hz – 50kHz (-0,8dB, -3dB)
  • Channel separation: >100dB bei 20kHz
  • Noise floor: >-100dB (A weighted)
  • THD: <0,05% at 100W
  • Gain: 26dB
  • Pre in: 1 RCA/phono socket
  • 1 XLR socket
  • Wiring: 1 ground, 2 “hot” and 3 “cold”
  • Input sensitivity: 1,35V
  • Input impedance: 22kohms
  • Speaker connectors: 4mm banana plugs, spades connectors or naked wire
  • Outboard power supply: ±48V/2,5A DC, suitable for your country’s mains supply
  • Power consumption: 2,5A DC, <1W in standby