wouldn't that void the warranty?
i could try that, even tho it doesnt seem to be some resonance sound, like it isn't bolted on and it vibrates. It's exactly that large transformer hum. Does it mean that it's a faulty one? As i said, in my identical subwoofers, one of them hums and pops, the other one doesnt. There was a fix on their website, they replaced some of the components, but you had to send it in and pay about $400.
also, the transformers in my other amp (Rotel Rb 1090) are huge, 1.2kwa each and there is 0 hum, so there must me something wrong.