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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


Technical Specifications

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
Line level inputs:2 pair RCA
Input impedance25k 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 control1x CR2032 / 3V or CR2025 / 3V
Dimensions W x H x D with sockets103 x 37 x 115 (138) mm
Weight450g without power supply

Pro-Ject - Stereo Box S3 BT


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