Pro-Ject Phono Box S2 Ultra – Audiophile MM/MC Phono Preamplifier

The Pro-Ject Phono Box S2 Ultra brings ultra-clean, disc-level detail to your vinyl collection. With a fully discrete, op-amp-free design built around audiophile-grade polystyrene capacitors and split RIAA equalization, it delivers refined, dynamic sound.

Key Features

• Op-amp-free, discrete circuit design: Delivers harmonious, natural sound without coloration
• Polystyrene capacitors: High-end components revered for transparent reproduction and tonal purity
• Split RIAA equalization: Precise, accurate roll-off that maintains timbral integrity
• Switchable subsonic filter: Cuts rumble at –18 dB @ 20 Hz to clean up low-end noise
• Adjustable loading: Selectable input impedance (10 Ω–47 kΩ) and capacitance (100/220 pF) for optimal cartridge matching
• Four gain settings: Choose between 40 dB, 43 dB, 60 dB, and 63 dB to match both MM and low-output MC cartridges
• Robust metal housing: Shields against electromagnetic interference and mechanical vibration

Customer Benefits

Whether you're using a high-output MM or a sensitive MC cartridge, the S2 Ultra gives you rich tonal detail and dynamic clarity with minimal effort. Its thoughtful component choices and flexible adjustment settings mean you can tailor performance to your system—even on budget—yet deliver high-end fidelity without compromise.

Quick Specs

• Input impedance: 10 Ω, 100 Ω, 1 kΩ, 47 kΩ
• Input capacitance: 100 pF or 220 pF
• Gain options: 40 dB, 43 dB, 60 dB, 63 dB
• Subsonic filter: –18 dB @ 20 Hz
• Signal-to-noise ratio (MM): 89 dB
• Total harmonic distortion: 0.00052 %
• RIAA accuracy: < 0.4 dB (20 Hz–20 kHz)
• Inputs/Outputs: 1 × RCA in, 1 × RCA out
• Power: External 18 V DC / 500 mA (unit draws 80 mA)
• Dimensions (W × H × D): 10.3 × 3.7 × 11.9 cm
• Weight: 570 g (without power supply)

What’s in the Box

• Phono Box S2 Ultra unit
• External 18 V DC power supply
• Documentation

Use Cases / Ideal For

Perfect for vinyl enthusiasts or audiophiles seeking transparent, musical reproduction. Ideal for systems using MM or MC cartridges that demand accurate sound and flexible loading in a compact, stylish design.

Compatibility

Connects via standard RCA to any amplifier or integrated system. Fully supports MM and MC phono cartridges with selectable impedance and gain settings for precise matching.

Pros & Cons

✅ Pros:

• Exceptionally clear, natural sound from discrete, op-amp-free design
• Flexible loading and gain adjustability tailor performance to your cartridge
• Compact, well-shielded metal construction resists interference

⚠️ Cons:

• No built-in grounding or USB output—external setup required for digital integration
• Requires external power supply, adding cable to your setup

The Pro-Ject Phono Box S2 Ultra combines intelligent engineering and selective circuitry to deliver vinyl playback that sounds refined, musical, and thoroughly modern—crafted for those who demand more from every rotation.