I have a pair of RT3000p's and both of them make an annoying hum noise when powered on. I've checked audio sources and is constant regardless if there's a source or not, they just need to be powered on. Is this a group loop issue or could it signal failing filter caps? I'm not really familiar with what the filter caps are or do but I've read this elsewhere.
The other issue is that the power switch on one of them doesn't appear to be working as it won't turn off in the off position and it no longer powers off automatically. The only way to turn it off is to unplug the unit. Combined with the hum, this is maddeningly annoying.