pro-ject stereo box s3 bt
pro-ject stereo box s3 bt
pro-ject stereo box s3 bt

Pro-Ject Stereo Box S3 BT: Compact integrated amplifier

Pro-Ject Audio Systems has introduced a compact integrated amplifier Stereo Box S3 BT , equipped with a Bluetooth adapter supporting the aptX HD codec , which allows you to stream music from mobile gadgets to it with the highest possible quality today.

In addition, for connecting sources, the novelty offers two analog inputs on RCA connectors. There is even a pre-amplifier output here, implemented on a 3.5 mm minijack connector. The amplifier develops 21 watts in each channel when operating on a load with a nominal resistance of 8 ohms and 40 watts at a load of 4 ohms. High-quality screw terminals are provided for connecting acoustic systems.


The Pro-Ject Stereo Box S3 BT amplifier is dressed in a metal case with an aluminum front panel, on which there is a large volume control knob, a power button and an active input switch button with LED indicators. The power supply of the device is external 20V/3A.

The novelty is expected to go on sale in the very near future. The suggested retail price  of the Pro-Ject Stereo Box S3 BT in Europe is 399 euros .


  • Bluetooth version:    5.0 with support for aptX, aptX HD, A2DP
  • Output power:    2 x 21W (4 ohms) / 40W (8 ohms) at 1% THD
  • Frequency response:    20 Hz – 20 kHz (-1.5 dB)
  • Signal to noise ratio:   96 dB
  • Channel separation:   -67 dB @ 10 kHz
  • THD:    <0.12% at 5W/4Ω
  • Gain:   32.5 dB
  • Line inputs: 2 x stereo RCA
  • Input impedance:    25 kOhm
  • Preout :    3.5mm mini jack
  • Dimensions (W x H x D):    10.3 x 3.7 x 11.5 cm
  • Weight:   450 g (without power supply)