Start with buying 1 PS Audio Noise Harvester ( $75 form Music Direct
or 2 for $100 ) , if the light blinks anytime other than when your
heating/air conditioning is running then consider a power conditioner,
if it doesn't blink then you have fairly clean power , seeing will help you decide before you go out and spend a bunch of $.
A dedicated line is only good if you have a high current drawing amp ,
noise from anywhere in the house will still be on your dedicated line.
or 2 for $100 ) , if the light blinks anytime other than when your
heating/air conditioning is running then consider a power conditioner,
if it doesn't blink then you have fairly clean power , seeing will help you decide before you go out and spend a bunch of $.
A dedicated line is only good if you have a high current drawing amp ,
noise from anywhere in the house will still be on your dedicated line.