While I am by no means qualified to debate the effects of RF in a metal tube on audio quality. Nor am i able to tell anyone how much voltage through a regulator you can have and what if any effects that would have on sound quality. I still feel that A LOT of people use 7.4 volt Li-Ion setups with U.S. boards and do not see the same problems. I have 2 U.S. 2.1's both with 7.4V Li-Ion power cells, neither creates a hissing noise. One is a lux 3 Gree the other a lux 3 Red Orange.
I think we may be barking up the wrong tree on the over voltage diagnosis.
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