Crooner,
That is some serious PS you got there. What are those 3 black things on the right side of the picture. Are they ferrite beads?? How much improvement do you notice on this one over your old Power-One PS?
Yeah, they are ferrite beads to suppress EMI radiated from the big power transformer. I also used Stillpoints ERS sheets liberally inside the chassis for the same purpose.
Basically, the improvement I got was a smoother less "electronic" sound. More organic if you will. I built this one for sheer fun, to test how far one could go with a Squeezebox PS. But you can certainly get 80%, if not more, of the benefits with the smaller 3A Power One supply, IMO.
BTW, mine runs super cool for a 12A supply!