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Mackie 8 Bus noise - help

Have an older Mackie analog 8 Bus 8x2x2 board that has random computer noise occurring. Little 1/2 to 3 seconds of random frequencies, very low volume, but showing up on 1-2 LED segments across all 8 channel meters and the L/R as well. Definitely something internal to the board or external power supply. Not coming from any specific channel or inputs (have muted/disconnected everything.

Microphone weird noise / static / hum / helicopter please help :(

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Hi

I made a account here because I can't find help anywhere else.

I have had microphone problems for about a year.
When I touch computer case the noise isn't so bad but still exits, and when I move microphone in some positions the noise changes little bit. Time to time it was so bad that mic didn't pick my voice at all. Sometimes it was like helicopter...

Speaker question? Not sure what's going on or how to call it

So I picked a good-looking set of speakers up at a thrift shop for 5 bucks (Aiwa SX-LM99). Can't find much on them on the internet but they appear to be working fine. I tested them at a friend's place who had a proper speaker pre-amp and stuff. Connecting them to my own setup, however, posed some issues.

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