Quote:
Originally Posted by IROC
I know nothing about this (what a way to start a post  ), but it seems like the natural vibration of the electric cables is exciting your room at some natural frequency. It seems that ways to avoid this is to change the input frequency (can't do that) or change the stiffness/mass of the room to move that natural frequency node away from 60Hz.
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Thinking the same thing... or if it is electrical resonance... can you install an isolation transformer where the line enters the house?