NOTE: CONNECTING A LINE LEVEL DEVICE TO A PH INPUT MAY CAUSE THAT MIXER CHANNEL TO OVERLOAD AND OR DISTORT. GROUNDING SCREW When using (a) turntable(s), you will need to ground the RCA cable(s) by screwing in the grounding fork(s) to the GROUNDING SCREW located on the rear panel of the MM-4000 mixer. Attach a PHONO (Turntable) ground line to the silver GROUND THUMB SCREW that is situated at the bottom middle of the rear panel. MIC (MICROPHONE) INPUTS The MM-4000 has 5 MIC (MICROPHONE) inputs 1 m