I know this has been posted before, and I read the threads but still don’t see an answer. I upgraded recently from a p10 to a p20 and this resulted in my amps (D’agostino momentum 300 mono blocks) humming loudly enough to hear from across the room. I unplugged all components except the amps from the p20 and still had the hum. Also switched out power cables but still had hum. Plugging amps directly into outlet there is no hum. I have a dedicated 20 amp circuit using 15 amp plug to p20.
Talked to PSA and they sent me a new unit. I upgraded outlet to furutech and upgraded power cord to transparent 20 amp cable to use 20 amp plug on p20. Still have hum. The hum is louder in sine wave mode than multi wave and decreases when I lower the voltage selector down to 110v.
Any ideas on how to fix this issue? Is this happening on all p20s?