Yes the power supply is very important. Probably the one single part that will make the biggest difference is the diodes. They vary a lot with the best ones yielding a deep wide sound stage and a silky sophisticated sound, ie much less grain and glare. Unfortunately like everything else its not like you can tell from the specs. Fortunately unlike parts like caps even the really good diodes are still cheap, or in other words cost about the same regardless of sound quality. This one part makes such a big difference that Michael Spallone, who does a terrific Synergistic MPC mod, is happy to tell you how to do it all yourself- but keeps his preferred diode source to himself! Based on my mods, and since I didn't want to have to try half a dozen different rectifiers, it made sense to pay him.
You could ask around modder forums, see if you can get some advice.
Or considering how cheap they are just buy a few sets and plan on using whichever sounds best.
You could ask around modder forums, see if you can get some advice.
Or considering how cheap they are just buy a few sets and plan on using whichever sounds best.