Numark NS7III User Manual page 23

17. Grounding Terminal: If using phono-level turntables with a grounding wire, connect the
grounding wire to these terminals. If you experience a low "hum" or "buzz", this could
mean that your turntables are not grounded.
Note: Some turntables have a grounding wire built into the RCA connection and, therefore,
nothing needs to be connected to the grounding terminal.
18. Mic 2 Input (1/4" / 6.35 mm): Connect a 1/4" (6.35 mm) microphone to this input.
Microphone controls are located on the top panel on any channel whose Input Selector is
set to Mic2.
19. Motor Torque: Flip this switch to adjust the torque of the platters. At the high setting, the
platters will have the heavier, stronger feel of "modern" turntables. At the lower setting,
they are lighter and more graceful—the feel of a "classic" turntable.
20. Cooling Fan: Keep the area in front of this vent clear from obstructions. The fan behind
the vent cools the NS7III, preventing overheating.
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