Pro-Ject Pre Box S3 Pre Amplifier

The Pre Box S3 is a compact yet powerful all‑in‑one stereo control centre, uniting analogue, digital, wireless, and TV audio sources with exceptional audiophile performance and versatile connectivity.

• Remote control included
• Built-in Moving Magnet (MM) phono stage for direct turntable connection
• Connect headphones via 6.3mm jack
• Solid metal casing protects from interferences

Elegant, Compact Design

The Pre Box S3 is crafted to bring premium audio performance into a sleek, space‑saving enclosure. Its aluminium S3 chassis offers excellent shielding and durability, ensuring clean signal paths and long‑term reliability. Available in silver or black, it blends effortlessly into any modern hi‑fi setup, delivering both refined aesthetics and outstanding engineering in equal measure. Designed and manufactured in Europe, it reflects meticulous attention to detail and a commitment to quality craftsmanship.

Advanced Analogue Performance

At its heart, the Pre Box S3 features a dedicated moving‑magnet phono stage engineered for low noise, high gain, and exceptional linearity. This design allows your vinyl records to retain their natural tonality and dynamic presence. The motor‑driven analogue volume control provides precise adjustment while preserving signal purity, ensuring that every listening session is both engaging and accurate. Its dual‑mono circuitry further enhances stereo imaging and channel separation for an authentic high‑fidelity experience.

High‑Resolution Digital Technology

Digital sources are handled with finesse thanks to the Cirrus Logic CS4344 24‑bit/192 kHz DAC, delivering clean, detailed, and articulate sound across all supported inputs. Bluetooth 5.0 with aptX HD enables high‑quality wireless streaming up to 24‑bit/48 kHz, making it easy to enjoy near‑lossless audio from smartphones, tablets, or computers. Whether you're using physical media or streaming wirelessly, the Pre Box S3 maintains an impressive standard of clarity and precision.

Comprehensive Connectivity for Modern Systems

Designed as a true all‑in‑one hub, the Pre Box S3 offers 13 versatile in‑ and outputs to accommodate turntables, TVs, streaming sources, and more. Its eARC input allows seamless connection to modern televisions, while coaxial and optical S/PDIF inputs support digital audio at up to 24‑bit/192 kHz. Flexible output options include variable RCA to feed power amplifiers or active speakers, a fixed line‑level output for secondary zones or headphone amps, and a dedicated subwoofer output. With RS232 and trigger connections, it integrates flawlessly into smart home and custom installation environments, completing a highly capable and future‑ready system.

Control Interface - RS232
Amplifier Frequency Response (20 - 20,000Hz) - <-0.4 db
Channel Separation - 72dB at 10kHz
THD - < 0.007 %
Signal To Noise Ratio - 110 dB
Phono Input Gain (MM) - 45 dB
RCA Input(s) - 2x Pair RCA, 1x Phono MM (RCA)
Bluetooth Version - 5.0
Bluetooth Codecs supported - aptX, aptX HD and A2DP
HDMI Input(s) - eARC Input
Optical Input(s) - 2
Coaxial Input(s) - 1
USB Digital Input - 1 x USB Type-C
DAC Chip - CS4344
Headphone Output - 6.3mm Jack
Headphone Amp Output Power - 2x 70mW at 32Ω
Headphone Amp THD - 1 %
Fixed Analogue Output(s) - 1 x 3.5mm Stereo Jack
Variable Analogue Output(s) - 1 x RCA Pair
Subwoofer Output(s) - 1x Sub RCA
Trigger Connection - Y
External Power Supply Rating - 18V-500mA DC
Additional Dimensions (W x H x D) - With Sockets: 206 x 55 x 176 mm
Dimensions (W x H x D) - 206 x 55 x 153 mm
Weight - 1.02 kg