Our engineers have managed to squeeze even more power output into the compact S Series chassis. More power means less distortion, more headroom and higher volume when desired. The Bluetooth input allows you to choose your music from the comfort of your favorite listening chair. Stereo Box S3 BT also features 2x analog RCA inputs that can be selected with the remote or on the faceplate.

A Tiny Integrated Amp/Receiver with Huge Sound

Our Stereo Box S3 BT is perfect for listeners who value great sound but are limited on space. Connect up to two devices to the rear RCA jacks or send your favorite tunes from your phone or tablet with a third AptX Bluetooth input. Despite its tiny footprint, this integrated amp can compete with amps four times the size. Plug in & power your favorite pair of bookshelf speakers and use the supplied remote to adjust volume and input from your listening position- it’s that simple. Need more bass? The 3.5mm variable output jack at the rear can be used with a powered subwoofer for more low-end, or use the jack to hook up an external power amp such as Amp Box S3 . As usual, Stereo Box S3 BT is designed & handmade in Europe, available in a black or silver aluminum chassis.

Additional information
Weight 0.45 kg
Dimensions 13.8 × 10.3 × 3.7 cm



  • 2 x 40 watts @ 4 ohms output power
  • BT 5.0 with aptX HD capability (24bit, up to 48kHz)
  • Ultra-compact integrated amplifier
  • Analog 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 aluminum 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 @ 4 ohms
  • SNR: 96dB @ 4 ohms (100dB ‘A‘ weighted)
  • 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 bananas, spades or bare 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
  • Battery (remote): 1x CR2032 / 3V or CR2025 / 3V
  • Dimensions (WxHxD): 4.06 x 1.5 x 4.5″ (5.4″ w/ sockets)
  • Weight: 1 lb without power supply