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Pro-Ject Phono Box S3 B Phonostage

Pro-Ject Phono Box S3 B Phonostage

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Regular price $499 In stock now!
Regular price $349 Sale price $499 In stock now!
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Pro-Ject Phono Box S3 B Balanced Phonostage

An MM or fully balanced MC phonostage with two inputs and many settings. Made in Europe

In addition to settings for moving magnet cartridges, the Phono Box DS3 B allows you to upgrade to true balanced operation with a moving coil cartridge on most Pro-Ject turntables. This allows the input circuit to subtract hum and noise picked up during the transmission.

The Phono Box S3 B comes in a steel and aluminum chassis providing very high rigidity and splendid isolation from interference.

Advanced Circuitry

The Phono Box S3 B uses fully discrete audio circuitry.  New to the S3 line, all settings can be easily adjusted on the faceplate. You can connect two turntables at the same time. Each input setting is stored in the memory. A large gain range from 40 dB up to 65 dB is possible. You can match it with a wide variety of cartridges and seamlessly integrate it into the rest of your system, matching the volume levels accurately to other sources like CD players or streaming devices. The loading options for MM and MC are designed for compatibility with a wide array of cartridges. Ultra-low values like 50 pF or 10 ohms allow you to account for special situations, for example less-than-ideal higher capacitance cables. The Phono Box S3 B has always got you covered!


  • Balanced XLR inputs & outputs
  • 5-pin mini XLR balanced input
  • Fully symmetrical & discrete gain stage
  • Fully passive & discrete RIAA equalization
  • Fully discrete audio circuitry (no op-amps!)
  • MM & MC capable
  • Continuously variable loading
  • Precise MC cartridge matching
  • Low noise & low distortion
  • Trigger in/out
  • Heavy aluminum casing protects against interference
  • Available in silver or black


Input Impedance: 10, 50, 100, 1k, 47k ohms

Capacitance: 50, 150, 300, 400 pF

Gain: 40, 45, 60, 65 dB

RIAA Equalization Curve Accuracy (20 Hz-20 kHz): < 0.3 dB 

Inputs: 1 x 5-pin mini XLR, 1 x pair RCA

Outputs: 1 x pair RCA, 1 x pair XLR

Power supply: 18 V/500 mA DC

Power consumption: 170 mA DC, < 0.5 W standby

Dimensions (WHD): 8.1" x 2.1" x 6" (206 x 55 x 153 mm)

Weight, without PSU: 2 lb. (930 g)