The MCM-20.4 employs a unique configuration, offering 16 input channels arranged into 2 subgroups of 8, plus 4 more channels wired hard left and right in pairs. Each front channel features center detent Pan and Fader concentric controls plus balanced insert and mute switches.
4 auxiliary sends are provided; being AUX 1&2 mono sends, while 3 is Stereo. Sends can be done Pre or Post Fader. Master send levels are provided as well.
The insert send points always have the signal present, so they can alternatively be used as direct outputs for recording without additional patch bays.
Each group has its own stereo fader and balanced insert point and the 2 stereo subgroups are passively summed into the master bus. The gain is restored by means of a 73 style Class A, transformer coupled, mic preamplifier, featuring a total of 4 transformers (1input & 1output in each channel of the stereo bus).
The master section also has its own insert point on balanced gold plated XLRs.