Mixes 4,8,12, or 16 organ input channels into 2 high pass and 2 low pass (for pedal amplifier(s) and speaker(s),)or without crossover, with sufficient gain to eliminate the need for the high gain original Allen Organ amplifiers and allow you to use any off-the-shelf home stereo component system amplifiers including 5.1 or 7.1 simulated surround processors (including future Harrison Organ Works products). Each input has an optional un-mixed or bypass output RCA jack to allow use of a dedicated organ output channel that is also included in the mix down. The crossover frequency is 50hz. The picture was taken with the cover shield removed. Includes +/- regulate 15 volt power supply that can be ordered separated from the mixer board.