I picked up a AC12 power cable to feed my P20 and end up using a cheap US plug to UK plug adaptor to the wall (which I picked up from AliExpress with hot/neutral wire polarity correctly switch from US plug to UK plug into wall socket).
However, this seems to made my whole system plugged into P20 lost dynamic , lost bass, and everything sounded flat and no depth. Then I switched back to my normal power cable (DIY OCC copper thick gauge power cable) with normal UK plug from the wall to PS audio juice bar, then plug AC12 power cable into juice bar then to the P20. Once taken the US-to-UK plug adaptor out, this seems to have brought back everything I’ve lost and perhaps slighly more dynamic & bass maybe due to addition of AC12 power cable into P20.
I was a bit dumbfounded how in the world does an AC plug adaptor like below affect sound quality that much just having it between the wall and AC12 power cable to P20.
Then I went back to check PowerPlay and it seems the cheap AC plug adaptive had caused the P20
P20 THD out % to jump from normal 0.1% to 1.7% (which match THD in %) as the time lined up exactly. I’m even more surprise such AC plug adaptor can have such an effect on P20 THD output.
The only thing I can think of being the reason is perhaps poor or thin wire inside the adaptor, or the 13A standard fuse inside the US-to-UK adaptor contributed to this. What are your thoughts on this?