High Pitched Noise/Sound?

nesjess

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Donor 2011
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I know this may be a needle in a haystack problem, but I recently bought a Blue Elf 2 and Blue Elf adapter to plug it into my CPS1 cabinet.

Everything loads and plays fine including the game sounds/music, but there is this high pitched noise/sound coming from the speakers that is a bit annoying.

I have a feeling it's something to do with how the power/ground wires are wired, but I'm not sure. Though, my SFII board and other JAMMA boards play fine without this issue.

Any help is appreciated. Thanks!
 
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