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Not sure if this is the right place for this question. My local gym uses a Rolls Mini Mixer MX22A to mix a pair of RCA input with a wireless mic input to send to speaker. The MX22A gives some nasty feedback which seems to come from the DC input. If the power cable is wriggled, it goes away. Wondering if there is a ground issue and if there is any way of fixing that. Would also like to know if there are similar equipment to MX22A that can be had for cheap. Any help will be appreciated.