- For Balanced, Low Impedance Microphones. - High and Low Cut Fileters for tone control, 4.2k Hz and 330 Hz, 6 dB/octave. - Phantom Power, +22V DC for condenser-type microphones. Activate by default, cut Jumper J1 to disable. - Responds To Mute Bus Activation, via Mute SEND module or switch-closure. - Responds To Both Mute Bus #1 And Mute Bus #2 By Default (cut jumper(s) to disconnect individual mute bus). - Two Mute Response Modes (cut jumpers to configure): 1. Normally-ON - turns OFF during mute activation (most common) 2. Normally-OFF - turns ON during mute activation (functions as an ON/OFF switch, useful for zone-paging microphones in multi-amplifier systems) - Connector: removable terminal block.