Pro-Ject Phono Box S2 Ultra

Audiophile MM/MC Phonostage with Discreet Componentry


Phono Box S2 Ultra uses a fully discrete, Op-Amp-free design that fosters sonics rarely found in this class. On top of omitting Op-Amps, the selected polystyrene capacitors (known among audiophiles as the ‘holy grail’ for phono preamplifiers) significantly contribute to the clean, clear, detail-oriented sonics that S2 Ultra delivers. With wide-ranging flexibility in gain, load & capacitance, it can handle with grace almost any cartridge you throw at it. Split RIAA equalization creates an ultra-accurate representation of the RIAA curve, further refining what you hear. To protect the circuitry from potentially harmful interference, the S2 enclosure features a 2-layer enclosure comprised of aluminum & steel.

Audiophile performance

No operational amplifiers used

Audiophile-grade polystyrene capacitors

Precise split RIAA equalisation

Switchable Subsonic filter –18 dB @ 20Hz

Switchable input impedance/capacitance

Four adjustable gain levels

Solid metal casing protects from interferences

Outstanding sound quality

Available in silver or black

Handmade in Europe

Input impedance: 10, 100, 1k, 47k ohms / 100pF

Input capacitance/impedance: 100pF, 200pF, 320pF and 420pF */47kohms B

Input gain: 40 and 43dB B / 60 and 63dB A

Signal / Noise ratio MM: 85dBV (90dBV – ‘A’ weighted)

Signal / Noise ratio MC: 65dBV (71dBV – ‘A’ weighted)

THD: <0,0005% MM, < 0,004% MC

RIAA-equalization curve accuracy: <0,4dB / 20Hz - 20kHz

Subsonic filter: at 20Hz with 18dB/octave

Input: 1 pair RCA/phono sockets

Line-level output: 1 pair RCA/phono sockets

Power supply DC: 18V/500mA

Power consumption: 18V/80mA DC

A: typical for low output MC cartridges, B: typical for MM cartridges or high output MC
*Input capacitance is irrelevant for low output MC cartridges

Weight: 0.57 kg

Dimensions: 11.9 × 10.3 × 3.7 cm

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