• TRS or XLR balanced input and output diff erential. • Choice of Stereo or the sum of the synthesis of left and right channel subwoofer. • The scope of the two-channel selection switches are x10. • Two channels have 40Hz high pass fi lter (frequency cut end). • All outputs with phase reverse switch. • 24dB/oct Linkwitz-Riley fi lters (the professional standard). • Stereo / Mono status indication LED lights, indicate the selected mode of operation.