RFI from steel TV bracket?

What happens if you unplug the interconnects from the inputs to the amps? Do they still buzz?

Right now I'm sticking to my original theory, only substitute 'interconnects' for 'speaker cables', and since the ICs are single-ended, this makes a lot more sense.

Halcro, it really sounds like you may have created a primitive power transformer with your wiring setup. If that is the case, the metal frame is acting as the core and the speaker leads draped over it are the secondary.

Try re-routing the speaker leads.

Sounds to me like you have more troubles than you thought.

So let's go back to the time you installed this bracket thing.

What *other* changes did you do?

Hifihvn makes a good suggestion. You might be surprised how good some of Radio Shack's cables actually are.

Now. Since you are running single-ended cables, if there is a hum source (like the primitive transformer thing I mentioned), even if the cables are shielded you will still get a hum as single-ended cables have no 'Common mode rejection'. (IOW if you have balanced cables you may not have noticed a problem.)

So what I would do is temporarily reroute your cables so they are no-where near that bracket and for that matter, any power cords too. If you have to shut down everything but the amps, go ahead a do so for the purposes of this test. So hopefully you won't have to go to Radio Shack :)

Sweet.