What does this tell me?


I've got a buzzing issue that I'm trying to track down, here's what I know.
(FYI, my amp is an integrated)

~It's only coming out of the tweeters of my Vandersteen 2ce's.
~It happens regardless of the source, DVD player, Squeezebox or DAC.
~It only happens if I select an input that has a source connected to it. ie, if I switch to an input that has nothing connected to it, there's no buzzing.
~I've tried every input and they all buzz when something is connected to that input and they all don't buzz if there's nothing connected to that input.
~I've tried different power cables and IC's, they don't change anything.

I don't know where to go from here. Is it the amp? Is this a ground issue? What do I try next?

Thanks,
E-
ecruz
Sounds like it could be a grounding issue. Please give details on the circuit you have this connected to, if there is anything else connected on the same circuit in the room (lights, dimmer switches, power-blocks for computers, cellphone charging, etc...). what are you using for a pre-amp or processor, i.e., what's everything connected to? Have you had an electrician check that the outlets on the circuit are wired and grounded correctly?
Try process of elimination. Unhook all sources that you mention and install them one at a time until you find what is causing it.
It's a dedicated 20 amp circuit, with two outlets about 8 feet apart. It was
installed by my dad, who is an electrician.

One outlet has a TRL power strip plugged into it. Into the Power strip is the
Squeezebox, Oppo DVD player and Behringer DEQ. I have a Krell integrated
plugged straight into the wall.

The other outlet has Power Wedge power conditioner plugged into it. Into
that conditioner is a plasma tv, satellite receiver and sometimes a playstation.

I also have a Vandersteen sub plugged straight into the second outlet.