Pro-Ject Audio Systems
Pro-Ject Amp Box S3
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Amp Box S3
Micro audiophile stereo power amplifier
Efficient, audiophile & made in Europe!
The new Amp Box S3 offers one stereo RCA input and delivers powerful and room-filling sound to every loudspeaker. The new PCB concept & sophisticated topology achieves less distortion and a better signal to noise ratio. We designed this amp to match the sound characteristics of a tube amplifier as close as possible. Amp Box S3 brings you a rich and musical sound with an analogue touch of warmth into your living room. It is also the perfect solution for your desktop nearfield monitor speakers due to its size and superior spacious sound stage.
Application examples:
- HiFi Amplifier for 10-15 m2 rooms
- Audiophile desktop nearfield monitor amp
- Streamer power amp upgrade
- Multiroom power amp solution
- Home cinema power amp upgrade
- In-wall or celing speaker amp
The new Amp Box S3 is designed and produced in Europe and is available in a black & silver finish.
Features
- NEW PCB concept & sophisticated topology
- NEW lower distortion & better SNR
- Ultra compact & audiophile
- Advanced amplifier module
- Metal casing protects against vibration and interference
- Made in Europe
REVIEW & AWARDS
Test Mini-HiFi: Pro-Ject Pre Box S2 Digital and Amp Box S3 – Honey, I shrunk the amplifiers - Read More
"Not only from a sonic point of view but also because of the flexibility gained when upgrading/replacing individual components, making things more sustainable."
Test: Pro-Ject Pre Box S2 Digital and Amp Box S3: how small can HiFi be? - Read More

"It works! And much better than you would expect from these cute little devices. The Pro-Ject Pre Box Digital is a serious DAC and preamplifier for the most important digital sources, plus a headphone connection. And the Amp Box S3 stereo power amplifier is a no less impressive power amplifier in "nano format" with great sound capabilities for connection to a huge selection of passive speakers.
If you are looking for an affordable and truly space-saving audio component solution, you can hardly ignore the Pro-Ject S2/S3 series. The combination options are huge, but you are spoiled for choice. The two test candidates are an ideal team for desktop hi-fi, to upgrade the media center in the living room, or as a second system in other rooms." - Frank Borowski
SPECIFICATIONS
Power output | 2 x 23 W / 40 W at 8 ohms / 4 ohms |
Peak power | 2 x 50 W at 4 ohms |
Frequency response | 20Hz - 20kHz (- 0,7dB / 4 ohms) |
Channel separation | > -68 dB @ 20kHz |
Signal-to-noise ratio | 87dBV (100dBV-‚A‘ weighted)/4ohms |
THD | < 0,02% @ 10W / 4 ohms |
Gain | 31 dB |
Input | 1 pair RCA sockets |
Input impedance | 25 kohm |
Speaker sockets | 4mm Ø Banana, spades. pins or bare wire |
Trigger 12V DC | In&Out, 2-pole jack socket Ø 2,5mm |
Power supply | 20V/3A DC (universal power supply) |
Dimensions W x H x D | 103 x 36 x 118mm |
Weight | 385g without power supply |






