XLR balanced ins and outs

Mode switches for mono 4-way or stereo 2-way/3-way operation

Low frequency summed (subwoofer) output

x10 range switch on both channels

40Hz high pass (low cut) filter both channels

Phase reverse switch on all outputs

Individual level controls on all band outputs

24dB per octave Linkwitz-Riley filters (the professional standard)

Stereo/Mono status LEDs indicate the selected mode