Pro-Ject Audio Reveals New Integrated Amplifiers - Stereo Box S3 BT and MaiA DS3

Published On: November 15, 2022
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Pro-Ject Audio Reveals New Integrated Amplifiers - Stereo Box S3 BT and MaiA DS3

These two new integrated amplifiers pack more power and inputs into a tiny footprint.

Pro-Ject Audio Reveals New Integrated Amplifiers - Stereo Box S3 BT and MaiA DS3

By Author: Home Theater Review
The staff at HomeTheaterReview.com is comprised of experts who are dedicated to helping you make better informed buying decisions.

Pro-ject is moving the needle with more power and inputs on their recently announced compact amplifiers. Highlights include Bluetooth 5.0 with aptX HD and up to 150 watts per channel. These sleek amps are future proof and the minimal footprint will look great anywhere.

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These two new integrated amplifiers pack more power and inputs into a tiny footprint. b6ff8e1c maia ds3 hero shot scaled

The MaiA DS3 Stereo Integrated Amplifier is a compact, high-fidelity amplifier and receiver for up to (9) analog and digital audio sources. Boasting 150 watts of power per channel at 4 ohms, this dual-mono design features a built-in phono stage (MM/MC), DAC, headphone amp, Bluetooth receiver and a wide range of digital and analog for various uses. Available in a black or silver aluminum chassis, the design is sleek and rugged. Optional magnetic wooden side panels are available separately in walnut, rosenut and eucalyptus.

  • Powerful 140 watts per channel at 4 ohms
  • PCM 1795DB 32bit/192kHz Delta-Sigma DAC
  • BT 5.0 receiver with aptX, aptX HD, A2DP profile
  • 9 total analog & digital inputs
  • Sub & variable output
  • Built-in MM/MC phono stage
  • Dual-mono design
  • XMOS asynchronous USB  (24bit/192kHz)
  • DSD capability (DSD64, DSD128; DSD256)
  • Headphone output : 2x 430mW, 32ohm (1%THD)
  • Trigger in & out
  • Aluminum chassis protects against interference
  • Remote control included
  • Available in silver or black
These two new integrated amplifiers pack more power and inputs into a tiny footprint. 1276297b maia ds3 rear in silver


The Stereo Box S3 BT is an ultra-compact stereo integrated amplifier and receiver with dual analog inputs and an aptX capable BT 5.0 audio input for connection to Bluetooth devices. The (2) pair of RCA line inputs and (2) channels of 40 watts at 4 ohms output power are packaged beautifully in a protective aluminum casing, available in both black and silver. The unit includes isolated speaker outputs as well as a stereo preamp output for driving a subwoofer or larger amplifier.
Like all Pro-Ject Audio Systems products, the new models are handcrafted in Europe

These two new integrated amplifiers pack more power and inputs into a tiny footprint. b4989040 stereo box s3 bt front angle in black
  • 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
These two new integrated amplifiers pack more power and inputs into a tiny footprint. 471af826 stereo box s3 bt rear angle in silver
MaiA DS3Specs
Power output2x 80W/140W at 8 ohms/4 ohms (1%THD) Frequency response (20Hz-20kHz)
THD< 0.01% at 10W / 8 ohms
Headphone amp output2x 430mW at 32 ohms (1%THD) Line level inputs
Phono input1 pair RCA (for MM, MI and MC cartridges) Phono input sensitivity
USB inputUSB Audio Class 2 (requires USB 2.0 or higher) PCM sample rates
DSD supportDSD64, DSD128, DSD256
BT version & codecBT 5.0; aptX, aptX HD, A2DP profile Trigger in/out
Outboard power supply36V/5.5A DC
Power consumption<0.5W standby
Dimensions (WxHxD)8.11 x 2.8 x 9.45" (9.92" with sockets) Weight
Stereo Box S3 BTSpecs
Output power2 x 21W/40W at 8/4ohms (1%THD) Frequency response (20Hz-20kHz)
Channel separation-67dB @ 10kHz
THD<0.12% at 5W/4 ohms
Gain32.5dB
Line-level inputs2 pair RCA
Input impedance25k ohms
Variable line output3.5mm stereo jack
Speakers output4mm bananas, spades or bare wire BT version
BT codecsaptX, aptX HD, A2DP profile
Power supply20V/3A DC 100-240V, 50/60Hz Power consumption in standby
Battery (remote)1x CR2032 / 3V or CR2025 / 3V Dimensions (WxHxD)

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