I suggest you search using the term "yeti 1400". Look for a thread titled something like "sell your expensive power cords and try this". The Yeti 1400 is is a lithium-ion battery powered electrical generator. It generates a perfect sine wave. I tried it in my system and it is superb. It dramatically lowered my noise floor (I didn't have a "noise floor problem" and didn't have any expectations about how or whether this thing would make a difference). because of the lower noise floor it seems like the volume is turned up and the dynamics are much improved. Music seems to jump from the background. It seems more effective to me than sophisticated filters.
Going Battery Powered
I have a number of components that run off of 12V DC power. This includes my DAC, preamp, tube buffer, etc. I’m looking into powering them with batteries instead of 120V AC power supplies. Does anyone have any input on if this is worth my time? Seems like DC power is the cleanest power you can get in this situation. I’ve heard batteries can have reduced dynamics but I plan on using as big of a battery as is reasonable, most likely a large sealed AGM type battery. Do I need power supplies/voltage regulators if I use a large battery and only power low draw components (no power amps); e.g. the max amp draw is probably around 1-2 amps, if that. If I do, does anyone have a link to a design for the power supply/voltage regulator? Thank you.