The Phono Box

The Pro-Ject Phono Box is a compact, entry-level outboard phono preamplifier designed for turntables, supporting both Moving Magnet (MM) and Moving Coil (MC) cartridges via a rear-panel switch, featuring low-noise ICs, precise RIAA equalization, and a small metal case for minimal interference, ideal for budget audiophile setups.

• Input Capacitance/Impedance: MM: 47 kΩ / 120 pF; MC: 100 Ω / 120 pF.
• Gain: MM: 40 dB; MC: 60 dB.
• Output Voltage (Typical): MM: 300 mV / 1 kHz at 3 mV / 1 kHz; MC: 300 mV / 1 kHz at 0.3 mV / 1 kHz; max output: 9.5 V (1 kHz).
• Noise Floor: MM: 86-94 dB (A-weighted); MC: 68-75 dB (A-weighted).
• Total Harmonic Distortion (THD): MM: <0.01%; MC: <0.05%.
• Frequency Response/RIAA Accuracy: 20 Hz – 20 kHz / max. 0.5 dB deviation.
• Inputs/Outputs: 1x stereo RCA input (phono); 1x stereo RCA line-level output; gold-plated sockets; rear MM/MC switch.