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The M-21S from TOA Electronics is a microphone preamplifier module for 900 series amplifiers. It accepts balanced, low impedance mic signals and allows remote control of the input signal using an external potentiometer. It features gain control, high and low cut filters, and phantom power. It has five screw terminals for input connection.
In the Box
Toa Electronics M-21S - Microphone Preamplifier with Remote Volume Control for 900 Series Amplifiers (Screw Terminals)