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My opinion

The M60s are not likely to be damaged at all by typical power surges, although voltage fluctuations ARE likely to alter the sound quality. Nevertheless, I would not recommend that you use a surge suppressor of any kind with which I am familiar. The potential negatives outweigh the positives. Ditto for power conditioners, etc, when subserving amplifiers. So you just saved ca $2000!

Don't think you need a "20-amp" power cord. You might try experimenting with after-market power cords for a slight improvement in sound quality. My rules of thumb: (1) Expensive is not always better. (2) Wires that make good speaker cables also make good power cords. (3) Altho you don't need a 20-amp capacity, do be sure that the power cord can handle at least 6-8 amps or so. You might try the cheapest Mapleshade cords; they seem promising, by description.


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