You're completing the circuit with the volt meter. It's reading the circuit voltage the same as it would read when you touch the ends to a battery.Wait...a...minute...
The caps, right?
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No load. Was 12.1 at the speaker outputsProbably pretty small. Millivolts, right?
If it's a higher voltage at the speaker terminals and you don't have speakers hooked up, the caps could be holding a high static charge and there's no load on the speaker terminals to dissipate it.