It seems to me that if there were really a significant problem with the power coming from the wall that sources and preamps past a pretty moderate price point would all be battery powered. It wouldn't be particularly expensive to implement. You don't need to turn AC into DC anymore. Low power components don't use that much electricity so you wouldn't need huge batteries. It could be easily designed so that it automatically switched between two batteries where one was charging while the other was in use and the battery in use was completely physically isolated from the dirty AC.
I've thought about trying it myself with my Benchmark DAC2. I don't think a lot of people realize it but they'll accept DC so you could, if you wanted, string some batteries together and power it that way. Complete isolation would be better than the best power cord and power conditioner. The DAC only takes 15 watts I think.
I've thought about trying it myself with my Benchmark DAC2. I don't think a lot of people realize it but they'll accept DC so you could, if you wanted, string some batteries together and power it that way. Complete isolation would be better than the best power cord and power conditioner. The DAC only takes 15 watts I think.