Quite possibly; I don't think Cyrus are trying to sell us something useless in the PSX power supply. However, despite having had Cyrus amplifiers for quite a few years, I don't know because i) the power supply is expensive and ii) even if one could find a used one, it is not a plug-in user upgrade: something has to be changed on the circuit board, and, as far as I know, they don't tell us what.