I just modded my SU-1 by providing direct 5vdc from a Teknet battery I had laying around. The internal SU-1 power supply measured exactly 5.0vdc while my battery output 5.1vdc. Initial impressions are positive. So far there isnt a night and day difference but music does seem to emanate from a blacker background. I will listen more and report back.
I should note that I use a PS Audio P3 ac regenerator unit so maybe that is why I dont initially hear a a huge difference. Perhaps the SU-1 power supply is actually pretty good.
More to come.
I have a Singxer coming and I'm thinking of pulling out the stock power supply and putting it in a custom enclosure along with a set of Bybee Music Rails. That should work pretty well. I was also thinking, you could get some thin copper sheets and build a "enclosure within an enclosure" right inside the stock Singxer box.
You could pull the PS out, cover three sides with copper sheet, build a copper divider and I bet that also would help big league. Thoughts?