MC gain
MC (moving-coil) gain describes how much a phono stage increases the signal voltage at its MC input. It is expressed in decibels (dB).
Gain is usually quoted at 1 kHz because phono amplification varies with frequency. Higher dB means more voltage amplification.
In a phono preamp
Low-output MC cartridges produce a smaller signal than typical MM (moving-magnet) cartridges, so they usually need more gain. Choose a setting for your cartridge’s output using the cartridge and phono-stage guidance. Too little gain can leave a weak signal; too much can overload and cause distortion.
High-output MC cartridges may need an MM input. Follow the cartridge manufacturer’s specified input rather than choosing by the MC name alone.
Compare gain at the same frequency and output connection: RCA and XLR figures can differ. For a built-in phono stage, use its phono gain, not the host amplifier’s overall gain.
Sources
- Gain settings and output connections (pp. 4–5) — Pro-Ject Audio Systems
- High-output MC input matching (p. 2) — Ortofon
Sources
- Phono gain and the 1 kHz reference (p. 2) — Texas Instruments