I can feel it on the metal case of my SMSL SAPII TPA6120A2 amp with my fingers when I use it with its stock 24V 0.5A PSU. Feels like tiny vibrations. The AC plug of this power supply is the C type used in Europe. Is there a way to stop this leakage without replacing the psu? And can this leakage affect sound quality in some way (ground loops, I guess)? I find it strange that manufacturers ship so many products with ungrounded plugs, even audio manufacturers. IFI ships all their iPower PSU's with ungrounded plugs, for example. Why is that and what the hell are we supposed to do about it?