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Pro-ject Stereo Box S3 BT Integrated Amp

Pro-ject Stereo Box S3 BT Integrated Amp

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Regular price £359.00
Regular price Sale price £359.00
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  • Free Delivery
  • Demo Available
  • Trade-in Available
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Ultra compact integrated amplifier

With high quality AptX HD Bluetooth input!

Some setups make the use of big amplifiers impossible, but with the new Stereo Box S3 BT you have a big sound in an ultra compact casing. It features two line level RCA inputs and a AptX HD capable BT input to easily connect all your sources.

The Stereo Box S3 BT features enough power to drive your favourite speakers with a fantastic sound quality. The 3.5mm jack variable output can be connected to an additional amplifier, active speakers or a subwoofer. With its tiny formfactor it fits into every environment. The full aluminium/metal casing not only looks gorgeous but also protects against vibrations and unwanted interferences. For superior convenience it is also fully remoteable. Simply switch inputs and control the volume with the ease of pushing one button!

The new Stereo Box S3 BT is available in black and silver.

Designed & handmade in Europe

The new Stereo Box S3 BT is carefully designed and handmade in Europe. Our goal is to develop a technically flawless device in a housing that is only as big as necessary to safe raw materials. Due to the timeless design & rigid aluminium casework, the Stereo Box S3 BT is built for eternity. With high-quality materials and components, but also well-thought-out design, we want to be a pioneer in the industry.


  • 2 x 40 watts @ 4 ohms output power
  • BT 5.0 with aptX HD capability (24-bit, up to 48kHz)
  • Ultra compact integrated amplifier
  • Analogue volume control with motor driven potentiometer
  • 2 pair RCA line inputs
  • Variable output for subwoofer or second zone amp
  • Gold plated RCA connectors
  • Isolated speaker outputs
  • IR remote control included
  • Rigid aluminium casing protects against interference
  • Available in black or silver
  • Made in Europe



Output power: 2 x 21W/40W at 8/4ohms (1%THD)
Frequency response (20Hz-20kHz): <-1,5dB at 4ohms
SNR: 96dB (100 dB - ‚A‘ weighted) at 4ohm
Channel separation: -67dB @ 10kHz
THD: < 0,12% at 5W / 4 ohms
Gain: 32,5dB
Line level inputs: 2 pair RCA
Input impedance 25k ohms
Variable line output: 3.5mm stereo jack
Speakers output: 4mm banana plugs, spades connectors or naked wire
BT version: 5.0
BT codecs: aptX, aptX HD, A2DP profile
Power supply: 20V/3A DC 100 - 240V, 50/60Hz
Power consumption in standby: <0.5W
Replacement battery remote control 1x CR2032 / 3V or CR2025 / 3V
Dimensions W x H x D with sockets 103 x 37 x 115 (138) mm
Weight 450g without power supply

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Pro-ject Stereo Box S3 BT Integrated Amp
Pro-ject Stereo Box S3 BT Integrated Amp

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Pro-ject Stereo Box S3 BT Integrated Amp
Pro-ject Stereo Box S3 BT Integrated Amp



Delivery & Returns

Delivery & Returns

We offer FREE delivery to the mainland UK (excluding Channel Islands, Isle of Man, Isle of White, Isles of Scilly, and some of the remote Scottish Isles).

For other areas please contact us for a quote. Select items can be delivered internationally by prior agreement. Again please contact us for a quote. We will always do our best to help.

Our aim is to dispatch goods within 2 working days of an order being placed. Please allow 5 working days from the time of your order to receipt of item. If an order is expected to take longer than this our order fulfillment department will contact you to inform you of this.

Where multiple items are ordered, we will dispatch them all in one package. If you have ordered any special or customized items, or items otherwise not immediately available, we will dispatch the order when all items are available. If you have any concerns regarding this, please contact us and we will do are very best to help you.