Assertion: amplifier's switch | /r/ObjectUse | used in case of a humming ground loop
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Source sentences:
text: Higher-cost amps for professionals with an XLR DI out jack may also have a "ground lift" switch (to be used in case of a humming ground loop), a DI out level control knob, and a switch which determines whether the DI out signal to the PA or recording mixing board is pre- or post- the amp's internal preamplifier and equalization circuitry.