Pro-Ject Stereo Box DS3
Hybrid integrated stereo amplifier combining ECC82 tube preamplification with a MOSFET power stage, delivering 150 W per channel into 4 ohms.
Description
The Stereo Box DS3 is a class AB integrated stereo amplifier designed to drive a pair of speakers directly, without any additional electronics. It is built around a hybrid architecture combining an ECC82 valve preamplification stage with a MOSFET transistor power stage, housed in a machined aluminium chassis.
The ECC82 valve stage shapes the sonic character of the preamplifier, while the MOSFET amplification handles power delivery, with 150 W per channel into a 4 ohm load. The frequency response extends from 20 Hz to 20 kHz and the stated total harmonic distortion is 0.005%, two figures that reflect accurate reproduction across the entire audible spectrum. A signal-to-noise ratio above 100 dB also keeps perceptible background noise to a minimum, particularly on quiet passages.
- Input impedance of 47 kohms and output impedance of 8 ohms
- Three RCA line inputs
- Two speaker outputs
- Power consumption of 150 W at 220-240 V, 50/60 Hz
This model is aimed at anyone wanting a compact amplifier able to drive demanding speakers directly, with a system pared down to the essentials: line sources, speakers and nothing else. Its power output into 4 ohms suits speakers that require current without needing a separate power amplifier.
Technical specifications
| Type | Class AB integrated stereo amplifier |
| Output power | 150 W per channel into 4 ohms |
| Preamplifier | ECC82 valves |
| Power amplifier | MOSFET transistors |
| Frequency response | 20 Hz to 20 kHz |
| Total harmonic distortion | 0.005% |
| Inputs | 3 RCA line inputs |
| Outputs | 2 speaker outputs |
| Input voltage | 220-240 V, 50/60 Hz |
| Power consumption | 150 W |
| Signal to noise ratio | > 100 dB |
| Input impedance | 47 kohms |
| Output impedance | 8 ohms |
| Dimensions (H × W × D) | 80 × 210 × 220 mm |
What to check before buying used
On this hybrid model, the main point of attention is the ECC82 preamplification valve: its condition and self-noise (microphony, hiss) should be checked, and its eventual replacement anticipated, as this is a normal wear item on this type of stage. A check of proper operation of both speaker outputs and the stability of the MOSFET power output under load is also recommended before purchase.
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