Hantra- unless the circuit breaker box is in the same room as your audio equipment, why waste the money on the $20./sheet ERS?
IMO, this stuff works best on switching power supplies, like the ones found in most CD/DVD players. If your equipment has linear power
supplies. don't waste your time & money.
If you're worried that RF/EMI is leaping out of your A/C wall outlets, hire an exorist.