Pro-Ject Phono Box S2 Ultra | Phono Preamp

Phono Box S2 Ultra is Classic Pro-Ject Design, Upgraded and Refined

Audiophile performance with polystyrene capacitors
Switchable input impedance/capacitance
Four adjustable gain levels
Precise split RIAA equalization
Handmade in Europe

Elevating the Fundamentals
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.
Specifications
General


Weight: 1.25 lbs

Dimensions: 4.7" x 4.1" x 1.4"
Pro-Ject 2 Year Warranty

Phonostage


Input Impedance: 10Ω, 100Ω, 1kΩ, 47kΩ / 100pF

Input Capacitance/impedance: 100pF, 200pF, 320pF and 420pF */47kΩ B (Input capacitance is irrelevant for low output MC cartridges.)

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

SNR MM: 85dBV (90dBV – ‘A’ weighted)

SNR MC: 65dBV (71dBV – ‘A’ weighted)

THD MM: <0,0005%

THD MC: < 0,004%

RIAA-equalisation 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

Outboard power supply: 18V/500mA DC, suitable for your country’s mains supply

Power consumption: 18V/80mA DC

A: typical for low output MC cartridges

B: typical for MM cartridges or high output MC