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General audio topics that don't fit into specific categories.

Interconnects, speaker cables, power cords, TV coax, etc.

All you need is some broadband noise from an external source to excite the resonances in any of these cables.

Linear power supplies with capacitor input filters and junction diode rectifiers are excellent sources of noise. Nearby TV satellite or cable converters, wireless routers for home computers, portable phones, the X-10 wireless control devices, etc., etc., all contribute.

Keep in mind that RFI does not respect the audio component designer's wishes for the input and output ports. It can come out the input ports and go in through the output ports.

Regarding mechanical resonances, do you think there is no sound from your audio system behind your rack? Do you think your rack itself is not a resonant structure, or the equipment panels to which your cables are attached?

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