The Pro-Ject Phono Box S2 Ultra was engineered to provide reference-level analog playback performance in a compact audiophile component. Designed for demanding vinyl enthusiasts and high-end HiFi systems, the S2 Ultra significantly improves upon traditional phono stage designs through the use of ultra-low-noise discrete circuitry, precision component selection, and advanced split-passive RIAA equalization.
Unlike conventional op-amp-based phono stages, the S2 Ultra utilizes a fully discrete analog architecture carefully optimized for superior transient response, lower distortion, and improved musical realism. This design allows the preamplifier to reproduce vinyl recordings with exceptional transparency, micro-detail retrieval, and natural tonal balance.
At the core of its performance is the split-passive RIAA equalization network, an advanced circuit topology rarely found in this price category. By separating the equalization stages, the S2 Ultra achieves significantly greater RIAA accuracy while minimizing phase errors and preserving low-level musical information.
The unit supports both MM and MC cartridges with extensive adjustment flexibility. Gain, capacitance, and impedance settings can be configured directly from the underside of the chassis, allowing precise cartridge matching for optimal sonic performance across a wide variety of turntable systems.
For moving coil cartridges, impedance loading can be continuously adjusted from 10 ohms to 1 kOhm, while multiple capacitance settings optimize moving magnet cartridge compatibility. This flexibility makes the S2 Ultra suitable for both entry-level audiophile cartridges and highly advanced low-output MC designs.
The fully shielded aluminum chassis protects sensitive analog circuitry from electromagnetic interference while maintaining a rigid and elegant compact design. Gold-plated RCA connections and premium internal components further contribute to signal purity and long-term reliability.
Despite its compact footprint, the Phono Box S2 Ultra delivers sound performance typically associated with significantly larger and more expensive phono stages. The result is a highly refined analog presentation with deep soundstage layering, precise imaging, controlled bass response, and smooth natural high frequencies.
Combining advanced analog engineering, extensive cartridge optimization, and true audiophile refinement, the Pro-Ject Phono Box S2 Ultra represents one of the most sophisticated compact phono preamplifiers in its class
• Product Type: MM/MC phono preamplifier
• Circuit Design: Fully discrete analog circuitry
• Equalization: Split-passive RIAA equalization
• Cartridge Compatibility: MM / MC
• Gain Settings: 40 dB / 43 dB / 50 dB / 60 dB / 63 dB
• MM Input Impedance: 47 kOhms
• MC Impedance Adjustment: 10 Ohms – 1 kOhm variable
• MM Capacitance Settings: 47 pF / 147 pF / 267 pF / 367 pF
• Frequency Response: 20Hz – 20kHz (+/- 0.2 dB)
• THD: <0.00052%
• Signal-to-Noise Ratio: 86 dB (MM) / 68 dB (MC)
• Channel Separation: >85 dB at 20kHz
• Inputs: 1 × RCA stereo pair
• Outputs: 1 × RCA stereo pair
• Output Voltage: 500 mV at 1kHz
• Power Supply: 18V external power supply
• Chassis Construction: Aluminum / metal
• Dimensions: 10.3 cm × 3.7 cm × 11.9 cm
• Product Weight: Approx. 570 g
• Available Finishes: Black
• Reference-grade audiophile phono preamplifier
• Compatible with MM and MC cartridges
• Fully discrete analog circuitry
• Split-passive ultra-linear RIAA equalization
• Ultra-low-noise signal architecture
• Adjustable gain settings
• Adjustable impedance and capacitance loading
• Precision cartridge matching capability
• Gold-plated RCA connectors
• Shielded aluminum chassis construction
• Exceptional detail retrieval and transparency
• Wide and accurate soundstage reproduction
• Excellent channel separation
• High dynamic range performance
• Compact premium S2 chassis design
• Optimized for advanced HiFi vinyl systems
• Premium audiophile internal components
• External low-noise power supply included
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