If you own an expensive amp (or non-expensive, but you want to protect it) you may take a look at Furman Sound AR-20 II amp regulator, a device to protect your amp from irregular voltage damage.
There are some places where AC is not regular as should be and voltage peaks can break your amp, or any AC powered device you use. AR-20 II will protect up to 20 devices from this voltage problems and from electromagnetic and radio frequency interferences. The AR-20 II accepts input from 97 to 141 volts and it outputs a constant 120 volts signal.
Recommended price for AR-20 II is $1,250.
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