I Spotted a Pure power 2000 ac regenerator for sale. Considering the unit cos I believe my wall power supply is probably unstable ; some evenings my system sounds terrible and sublime on other evenings. My system comprises Pass Labs Xa 100.8 mono blocks , MSB DAC and MSB TRANSPORT , and Aurender X100L. Tried calling Pure power by telephone but nobody answers. Question is can I trust the brand and would the AC 2000 be sufficient for my kit?