S.P.C. Inverse IR100 R reverse RIAA PCB (Line/Au)

A ready-to-use stereo reverse RIAA equalizer board that converts a normal line-level or aux signal (from a phone, computer, CD player, DAC, etc.) into a proper phono-level signal with the correct RIAA curve. Simply plug it between your modern source and the phono input on an amplifier or receiver.

Why I made it

Many people still love older amplifiers and receivers that only have a phono input, or they want an easy way to test and calibrate a phono preamp without needing a turntable. I wanted a clean, reliable, passive solution that needs no power supply and works with both Moving Magnet (MM) and Moving Coil (MC) inputs.

What makes it special

Fully passive – no batteries or power required

Selectable attenuation: –40 dB (MM) or –60 dB (MC)

High-quality metal-film resistors and polycarbonate capacitors for accurate RIAA response (±0.5 to ±1 dB)

Compact 65 × 45 mm board, assembled and tested, ready to use

5-year warranty

Just connect your source to the input RCAs and the output RCAs to your amplifier’s phono sockets – and enjoy modern sources through classic equipment.