PRO-JECT PHONO BOX S3 B – BALANCED AUDIOPHILE PHONO PREAMPLIFIER

Phono Box S3 B is a fully balanced phono preamplifier, developed for audiophiles who want maximum flexibility and uncompromising sound quality for both MM and MC pickups. With a newly developed cabinet, front-mounted settings and advanced discrete circuit design, the S3 B sets a new standard in its price range

HIGHLIGHTS

• 5-pin mini XLR input for balanced connection
• Balanced XLR outputs and RCA line out
• Fully discrete and symmetrical gain stage without integrated circuits
• Semi-passive RIAA equalization for low noise and high precision
• Adjustable impedance and capacitance values ​​(10–47k ohms / 50–400 pF)
• Gain range from 40 dB to 65 dB – ideal for both MM and MC pickups
• Dual mono design for maximum separation and low distortion
• Subsonic filter at 20 Hz with 18 dB/octave slope

BALANCED AND DISCREET CIRCUIT

The heart of the Phono Box S3 B is the fully discrete, symmetrical gain stage. By using individual electronic components instead of standard integrated circuits, more precise signal processing and significantly improved sound quality are ensured. The balanced design makes it possible to effectively remove noise and interference, so that the music appears clean and detailed.

SEMI-PASSIVE RIAA AND SUBSONIC FILTER

After processing the balanced signals, they are passed through a semi-passive RIAA equalizer, which provides high precision and a natural frequency response. For vinyl enthusiasts with bass challenges, a subsonic filter at 20 Hz is built in, which reduces unwanted resonances without affecting the musical experience.

FLEXIBLE SETTINGS

The Phono Box S3 B allows you to connect two turntables simultaneously, with each input having its own saved settings. The front panel provides easy access to adjust impedance, capacitance and gain directly, allowing the amplifier to be quickly adapted to different pickups and systems. This makes it a highly flexible solution for both experienced vinyl enthusiasts and those looking to upgrade from a simpler phono stage.

DESIGN AND CONSTRUCTION

With its new steel and aluminum chassis and full aluminum front, the Phono Box S3 B provides a robust construction and effective shielding against interference. The compact cabinet measures 206 x 55 x 153 mm and weighs just 930 grams (without power supply), making it easy to integrate into any setup.