Randy, there're two entirely separate questions involved; "cleaning" the power to purportedly improve sound quality, and surge protection to keep the equipment from destruction or at least serious damage. As I discussed in my previous reply, the power supply section of amplifiers supplies clean DC for use in amplification. As to surge protection, audio equipment can handle surges of hundreds of volts routinely and an unusual surge of more than a few thousand volts(e.g. from an almost direct lightning strike)would destroy the power cord before it reached the components. A surge protector might be of some use for the in-between area, but I use none. As I've said before(to Jack's delight), if a lightning strike destroyed my equipment, I'd just view it as being God's way of telling me that it was time to upgrade.
