The M-243 is an EIA Standard equipment rack (1-unit size) stereo mixer that comes with two monaural inputs, four stereo inputs, one stereo output and two monaural outputs. 2 mono and 4 stereo inputs, 1 stereo and 2 mono outputs plus 1 stereo and 2 mono sub-inputs to the output mix buses. Each input can be assigned to any combination ofthe three outputs. Switchable high pass filter on each monaural input to filter out unwanted low frequencies, especially for speech use.