I read on the Polk audio forum about "transformer lamination noise" and is caused by the building and collapsing magnetic field that surrounds the core laminations of the AC power transformers. Does anyone have experience in this field?
Could the EP500 be picking this up from the AC outlet.
It was mentioned in an earlier post to try at work your the neighbors place. Both are not possible but there is a audio store near me that may let me try plugging in the Sub there. That will be a few days away though.
