Integrated amplifiers — Pro-Ject Stereo Box S3 BT

The Stereo Box S3 BT with DAC is an integrated amplifier with built-in DAC and Bluetooth from Pro-Ject, built into a remarkably compact chassis. The Stereo Box S3 BT brings Pro-Ject's considered engineering to a space-efficient wireless-capable integrated format.

Key specs that matter

Two single-ended inputs are provided. Input impedance is 25,000 ohms. Output power is 21W into 8 ohms, rising to 40W into 4 ohms. Gain is 32.5dBu. Frequency response spans 20Hz to 20,000Hz within plus-or-minus 3dB. Signal-to-noise ratio is 96dB, with total harmonic distortion plus noise under 0.12%. At a remarkably compact 103 x 37 x 115mm and just 0.450kg, the Stereo Box S3 BT maintains a minimal, space-efficient integrated amplifier chassis.

Sound and use context

Expect an accessible, dependable amplification character reflecting the strong 96dB signal-to-noise figure, with the built-in Bluetooth connectivity and DAC covering both wireless and wired digital sources directly.

Pairing

The built-in Bluetooth connectivity and DAC cover both wireless and wired digital sources directly, and the modest 40W-into-4-ohms output suits compact, notably efficient loudspeakers.

Alternatives

Pro-Ject's own Uni Box S3 offers a related model with modern streaming functionality and a phono input within the same broader catalogue.