MONO switch. Set the CHANNEL LEVEL controls for individual headphone levels. Never connect anything except a Rane power supply to the thing that looks like a telephone jack on the rear of the unit. This is an AC input and requires special attention if you do not have a power supply exactly like the one originally packed with your unit.
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This is not a tele- does not ground the chassis through the line cord. The HC 4 can be grounded phone jack. Never use a power supply with your unit other than the one...
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Your basic, straightforward power switch. standard ¼" TRS stereo headphone set of headphones as they are driven When the yellow LED is lit, the HC 4 is ready plugs. from the INPUTS. It’s always a good idea to keep this control turned down to go.