I have some computer speakers which suffer from the following problem: when switches flip in certain devices in the house, like the thermostat on a radiator or the refrigerator, the speakers will emit a loud popping noise, caused (I believe) by changes in the voltage on the mains.
Would an isolation transformer between the speakers and the mains alleviate this problem?
If so, what capacity isolation transformer should I buy? The speakers are rated at 500W RMS (Logitech Z-5500). I've read that an approximate conversion of 500W to VA comes out to 500*sqrt(2) = 707. If I don't play the speakers at anywhere near maximum volume (certainly less than half the maximum), would a 600VA isolation transformer suffice?
Thanks for any assistance.