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RFI from steel TV bracket?

Yesterday I installed a new TV on a steel wall-mounted extendable bracket between all my electronic components.
I now have a low hum/buzz from both speakers on all sources....even with the preamp on mute?
When I switch the preamp off.....the hum is still there.
The only way to remove the hum is to switch the amps off?
I tried grounding the steel bracket to the preamp and then the amps without success.
The previous TV was in the same location but sitting on the shelf.....not a steel wall bracket.
Any help would be dearly appreciated?
128x128halcro
halcro's avatar
halcro OP
2,664 posts
 
Hi Ralph,
The interconnects were running under the steel bracket.......not draped over it.
The speaker leads are on the floor well away from the bracket (as they have always been).
I just re-routed the right channel interconnect to along the floor away from the steel bracket........but the hum is still there?
Again.......if I run in fully balanced configuration from preamp to amp......shouldn't this prevent any RFI/EMI interference?
Isn't that why all professional sound systems run in this way?
atmasphere's avatar
atmasphere
11,965 posts
 
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?
halcro's avatar
halcro OP
2,664 posts
 
What *other* changes did you do?
No other changes :^)
atmasphere's avatar
atmasphere
11,965 posts
 
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's avatar
halcro OP
2,664 posts
 
When I unplug the output from the pre-amp......the hum is still coming from the speaker.
But when I unplug the input to the amp (with the output still connected to the preamp)......the hum disappears :^)
If you're right.......any solutions other than removing the steel wall bracket?
Thanks
Henry
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