RS or dierential balanced XLR inputs and outputs. Choice of stereo or the sum of left and right channels while the synthesis of ultralow sound. X10 range are two-channel selector switch. Two channels have 40hz high pass lter (low cut) all the outputs with phase reverse switch. All the bands on the average output can be independently adjuested dB/ Linkwitz-Riley lters (the professional standard). Stereo / Mono status indication LED lights, indicating that the choice of unit of work pattern.