28 mono mic/line channels, 2 stereo line channels & 8 buses Ultra-low noise, high-headroom design Premium XDR?Extended Dynamic Range mic pre-amps Full gain range from 0 to 60dB, +22dBu line signal handling capability 130dB dynamic range Distortion less than 0.0007%, 20Hz to 20kHz 192 kHz bandwidth. Exceptional RF rejection utilizing bifilar-wound, DC-pulse transformer; the most bullet-proof RF rejection in the Industry, True logarithmic taper 60mm submaster & main mix L/R faders, Special design circuitry to minimize noise & crosstalk, Convenient ALT 3/4 bus Both mixers feature 6 auxes Active 3-band swept midrange EQ per MIC channel (positioned @ Mackie's popular musical frequency points) 4-band fixed EQ on the stereo channels Double-bused direct outs on the subs Air EQ on the subs Left, right & summed-mono XLR main outs. Globally switchable phantom power (for utilizing condenser microphones) 18dB/oct. 75Hz Lo Cut filter (perfect to cut stage rumble & mic handling noise) Rugged steel chassis & sealed, dust-proof rotary controls.