Pro-Ject Desktop Audio Stereo Power Amp Box Mono


Out of stock

  • Bi-Phase PWM(Pulse Wave Modulation) circuit.
  • Discrete design for ultra-dynamic playback and highest resolution.
  • SMD for short signal paths.
  • 1x40W@4ohms/1x28W@8ohms.
  • Ultra high-efficiency: approximately 80% of power consumption goes to ?power out?.
  • Gold-plated, over-sized binding posts.
  • Trigger-switching with Loop-out.
  • RCA-Loop-out, for Bi-Amping, etc.
  • Metal case shields the electronics from vibrational and electromagnetic interference.
  • Outboard power supply included.

This product is currently out of stock and unavailable.

The Pro-Ject Box Design Amp Box S Mono is an ultra-compact mono-channel power amplifier, which is both efficient and audiophile. Built upon the same principles as the stereo Amp Box S, the Mono design packs more of a punch than its sibling, and using two together to drive a speaker each offers an impressive sound performance.

A ultra-high-efficiency, Bi-Phase PWM (Pulse Wave Modulation) circuit with SMD parts gives outstanding audio performance and stays cool on the outside when in use. The sound quality from the Amp Box S Mono is aimed to be as close as possible to Class A tube amplifiers, with their liquid and life-like presentation.

The Amp Box S Mono is micro-sized, allowing for easy placement in any environment. It can also be remotely switched off via a trigger signal (a 45cm power-on cable is supplied for this purpose) for convenient operation. When bi- or tri-amping, this remote power signal can also be relayed to multiple units.

SKU: N/A Category:
Weight 670 g
Dimensions 141 × 103 × 38 mm


Black, White

Power Output 28W at 8Ω
40W at 4Ω
Frequency Response 5Hz – 20kHz (+ 0dB, – 0.5dB)
Noise Floor > -100dB (A Weighted)
THD < 0.05% At 10W
Gain 22dB
Input 1 Pair RCA/Phono Sockets
Input Sensitivity 1V
Input Impedance 47kΩ
Speaker Connectors Gold-Plated Terminals 4mm Ø Banana Plugs, Spades Or Naked Wire
Trigger 12V DC Switching Voltage
Trigger In/Out 2-Pole 2.5mm Ø Co-Axial Jack
Outboard PSU 20V/3A DC (Peak 7A DC)
Standby Power < 1W