Lots of speaker hum threads here and none seem to show a good fix. My TSPP has been humming in attract mode since day one. Of course it's not noticible during play, but when the room's quite the hum or buzz drives me nuts. Some reading here and some googlefoo lead to to RGP where there are several fixes, some dating back 12-13 years. I went with the adjustable pot mod and this completely eliminated my speaker hum. Check out the vid below for how I did it and the see (hear) the results.