I replaced my two (modem and router) LPSs from Aliexpress (complete with iFi DC Purifier and Bybee iQSE) with a 12V deep cycle automotive battery, which is only charged when not playing music. Moved my listening experience from mid-audience to front row seats!
I'm convinced that digital electronic equipment (in particular) are hypersensitive to the quality of input power and acoustic vibration.