The Pre Box S3 is a compact, versatile stereo preamplifier for modern hi-fi setups. It combines classic analog sources with contemporary digital interfaces, making it equally suitable for turntables, streaming sources, TV audio, and headphone use. Despite its small dimensions, it offers a complete preamplifier architecture, including a high-quality MM phono input, DAC, Bluetooth, and subwoofer output.

The solid aluminum chassis of the S3 series reliably protects against interference and underscores the purist Pro-Ject approach: maximum functionality in a minimal footprint – designed and manufactured in Europe.

Features & Highlights

• 9 inputs in total: 3 analog, 6 digital
• High-quality MM phono input with high gain and very low noise
• eARC input for direct TV connection
• DAC with up to 24-bit / 192 kHz via S/PDIF and USB-C
• Bluetooth 5.0 with aptX HD
• Dual-mono circuit design
• Analog volume control with motorized potentiometer
• Headphone output (6.3 mm jack)
• Variable and fixed line output plus separate subwoofer output
• Remote control included
• Solid S3 aluminum chassis
• Available in black or silver
• Made in Europe

Frequency response:
20 Hz – 20 kHz (-0.4 dB)

Line gain:
4.5 dB

Phono gain (MM):
45 dB

Channel separation:
72 dB at 10 kHz

Signal-to-noise ratio:
110 dB (120 dB, A-weighted)

Total harmonic distortion (THD):
< 0.007 %

Headphone amplifier:
2 × 70 mW at 32 ohms

Headphone output:
6.3 mm (16–600 ohms)

Analog inputs:
2 × RCA line, 1 × RCA Phono MM

Digital inputs:
1 × RCA coax, 2 × Toslink, USB-C (asynchronous), eARC, Bluetooth

DAC:
Cirrus Logic CS4344, 24-bit / 192 kHz

Outputs: 1 × RCA variable, 1 × 3.5 mm fixed, 1 × subwoofer RCA

Trigger output:
12 V DC

Power supply:
18 V / 500 mA DC, 100–240 V

Standby power consumption:
< 0.5 W

Dimensions (W × H × D):
206 × 55 × 153 mm

Weight:
1,020 g (excluding power adapter)

Herstellerangaben:

Audio Tuning Sales GmbH
Analog Way 1
A5 Business Park Mistelbach/Wilfersdorf
2130 , Mistelbach
AUSTRIA
info@project-audio.com

Verantwortliche Person:

ATR – Audio Trade HiFi – Sales Company LLC
Wallufer Strasse 2
65343 , Eltville am Rhein
Germany
pro-ject@audiotra.de