select equipment that already has good interference suppression.My apartment has very noisy AC power
I've done this extensively and here is my list of noise/interference sources in order of annoyance:Now go around and find which bits of kit are causing the mains noise. Is it the freezer, or TV, or fluorescent lamp, etc.?
I have filters like that which plug into outlets on the same circuit as my amps, but I'd like to get something similar I can put between noisy appliances and the wall to filter them directly. What would you use for that?The mains borne can usually be reduced by fitting interference suppressors at switches and across motors. These are simply an integrated R+C that are packaged specifically for this use.