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Pro-Ject Phono Box S2 Ultra Phonostage

Pro-Ject Phono Box S2 Ultra Phonostage

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Regular price $349 In stock now!
Regular price $349 Sale price $349 In stock now!
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Pro-Ject Phono Box S2 Ultra Phonostage

The Phono Box S2 Ultra is like no other phono preamplifier in its segment. The incredible success of Pro-Ject's Phono Box Ultra 500, incited it to introduce this marvelously sounding phono preamp into the regular S2 line. The solid metal casing protects against interference, and the internal design remains as spectacular as before.

A fully discrete, op-amp-less design, allows an incredibly harmonious sound. On top of leaving out operational amplifiers,  Pro-Ject decided to use polystyrene capacitors, which significantly contribute to the high-end sound of the Phono Box S2 Ultra. These capacitors are known amongst audiophiles as the holy grail for phono preamplifiers. The split RIAA equalization enables a pin-point accurate representation of the RIAA curve, a luxury many other phono preamps do not possess.


  • No operational amplifiers used
  • Audiophile-grade polystyrene capacitors
  • Precise split RIAA equalization
  • Switchable subsonic filter
  • Switchable input impedance/capacitance
  • Four adjustable gain levels
  • Solid metal casing protects from interference


Input impedance: 10/100/1,000 /47,000 ohm
Input capacitance: 100/220 pF
Gain switch: 40/43/60/63 dB
Subsonic switch: -18 dB @ 20 Hz
Signal-to-noise ratio: 89 dB
THD+N (MM/MC): 0.00052% 
RIAA accuracy: < 0.4 dB / 20 Hz - 20 kHz
Power consumption: 18 V / 80 mA
Outboard power supply: 18 V DC / 500 mA
Dimensions (WHD): 4" x 1.45" x 4.68" (103 x 37 x 119 mm)
Weight: 1.25 lb (570 g)