Marantz Professional A- B Box (Rack Mix 12) Lightweight, slim 1U rack-mountable 12 channel mixer 6 HDHQ combination inputs with MIC, Phantom and Line selector switches; 6 mono (3 stereo) RCA Inputs Balanced XLR line outputs; mic monitor 1/4" output; mono 1/4" line output Mic 1 Priority Control, Master and Individual level controls AC or 24V DC power inputs