Stereo half-frequency, signal-channel third-frequency electronic crossover. TRS or XLR balanced input and output differential , Choice of stereo or the sum of left and right channels while the synthesis of ultra-low sound. Two channels are selecred x10 range switch. Two channels have 40Hz high pass filter (frequency cut end). All outputs with phase recerse switch. Therefore, the output spectrum canbe independently adjusted average dB /oct Linkwitz-Riley filters (the professional standard).Stereo /Mono status indication LED lights, indicate the selected mode of peration.