Pro-Ject Stereo Box S3 BT Integrated Amplifier With Bluetooth

$629 $699
By Project


Stereo Box S3 BT

Compact Stereo Amplifier with Versatile Applications

Some setups make the use of big amplifiers impossible, but the new Stereo Box S3 BT gives you 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.

Designed & Handmade in Europe

The Stereo Box S3 BT features enough power to drive most bookshelf speakers and more efficient floorstanding speakers, and its tiny footprint lends it to a wide range of applications. It's designed and handmade in Europe. The goal of the S3 BT is to develop a technically flawless device in a housing that is only as big as necessary, to save raw materials and create the perfect amplifier for apartment listening. The timeless design & rigid aluminium casework mean that the Stereo Box S3 BT is built to last a lifetime.


  • 2 x 40 watts @ 4 ohms output power
  • BT 5.0 with aptX HD capability (24-bit, up to 48kHz)
  • Analogue volume control with motor driven potentiometer
  • Variable output for subwoofer or second zone amp
  • Gold plated RCA connectors
  • IR remote control included
  • 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