The Amp Box RS Stereo from Pro-Ject has the four specific characteristics that make for a true high-end amplifier:

1. Fully balanced double mono design
2. Highly efficient energy saving PWM modules
3. Tube buffer input stage
4. Upgrade option PS Box RS for more power and further improved sound quality

Amp Box RS offers 3-dimensional sound-staging, perfect micro dynamics and ultimate resolution combined with high power output and 2 ohm capability and also is the perfect solution for Bi– or Tri-Amping applications. Amp Box RS is the perfect companion for Pre Box RS and will give pure sound experience, that the real audiophile is looking for. Because of its heat emission Amp Box RS luxury casing, which is available in silver or black finish, should not be combined with Design Box Acryl.

The addition of linear power supply Power Box RS Amp adds even more depth and lets you hear all microscopic fine detail.

Additional information
Weight 2.12 kg
Dimensions 22 × 20.6 × 7.2 cm



  • Fully balanced double mono design (Pulse Wave Modulation)
  • 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: 2 x ECC88 (6922)
  • Power output: 2 x 110W/180W at 8 ohms/4 ohms (both channels driven)
  • Frequency response: 10Hz – 50kHz (-0,8dB, -3dB)
  • Channel separation: >100dB bei 20kHz
  • Noise floor: >-100dB (A weighted)
  • THD: <0,05% at 100W
  • Gain: 26dB
  • Pre in: 1 pair RCA/phono sockets
, 1 pair XLR sockets
  • 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