ericsch ...
The best place to start with the mats has been covered in the various PPT threads over time. With that said, my own experience tells me that the circuit breaker box is the best place to start. If you can fit a couple of Omega + mats right up against the switches, then do that. If that is not possible, then put them up against the metal door that encloses the switches.
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Before he passed, Tim was treating the label side of his CDs with Total Contact. He said that it made a significant improvement in SQ. I'm tempted to treat a burned CD and compare it with the original.
Frank