something looped-
it happened to me a few weeks ago also, had a electrical storm(freeky snow one) so i shut everthing off, when i turned it back on i had a hum.
had a electrician stop by and found 5 volts on my water pipes used as a ground by previous owner,traced to a bad outlet in the kitchen-
still have a small hssss that you can hear from about 2 inches from tweeter that i never had.
yesterday i had a new humm,cable guys have been working in the neighborhood this week so first thing i did was unhook cable-i'm
going to buy a cable ground lift
