The M-03P from TOA Electronics is a microphone input module for use with 900 series amplifiers. It features a 1/4" (6.3mm) jack for accepting high-impedance, unbalanced mic signals. It has controls for gain adjustment and high and low cut filters.
In the Box
Toa Electronics M-03P - Microphone Input Module for 900 Series Amplifiers (Unbalanced 1/4" Female)