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Pro-Ject Amp Box S Mono Power Amplifier
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Pro-Ject Amp Box S Mono Power Amplifier

£165.83 Exc. VAT |  


Manufacturer:  Pro-Ject



Pro-Ject Amp Box S Mono 

Priced £198.95 per piece (so you would need two for stereo output), this mono-channel power amplifier pumps out an impressive 28 Watts (40 Watts at 8 ohms!); all from within a small but well-built form factor. 

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.



Bi-Phase PWM(Pulse Wave Modulation) circuit 

Discrete design for ultra-dynamic playback and highest resolution 

SMD for short signal paths 


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 



Power Output:

28W at 8Ω
40W at 4Ω

Frequency Response:

5Hz - 20kHz (+ 0dB, - 0.5dB)

Noise Floor:

> -100dB (A Weighted)


< 0.05% At 10W




1 Pair RCA/Phono Sockets

Input Sensitivity:


Input Impedance:


Speaker Connectors:

Gold-Plated Terminals For...
4mm Ø Banana Plugs, Spades Or Naked Wire


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

Dimensions (W x H x D):

103 x 38 x 141mm


670g (Without PSU)



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