First you must determine if the mic's output from the receiver is low or high impedence. Tip: high imp. is usually a 1/4" jack , low imp. is a 3 pin XLR Conector. It also depends on your amplifier input jacks.But really you should connect the mic to a mixing console and then connect the console to the amp.But you could connect a high imp. mic via a 1/4" to 1/4",cable into the 1/4" jack on your guitar amp.
Should the amplifier go into protect mode, simply disconnect all RCA and speaker leads, while keeping +12 volt, power ground and remote leads connected.
1. Now turn the amplifier back on, and if the diagnostic LED lights, the amplifier has an internal fault.
2. If not, plug the RCA cables back, and reset the amplifier. If it goes into diagnostic now, the fault lies in the input, either with bad cables or source unit.
3. If the amplifier seems fine with RCA cables plugged in, connect the speakers, one at a time, and if one of the speakers or its wiring is faulty, it will activate the diagnostic
system.
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