Just added the entry level 9v/2.0A iFi Silent Power (iPower2) to the Wyred4Sound Recovery, along the USB route into the SMSL M400.
Wow!
I am hearing improvements with the iPower2+W4S+M400 (e.g. quieter background, enhanced low level detail retrieval, improved 3-D spatiality/imaging, etc.) on-par with, or perhaps even greater than, that of adding the iPower Elite to the Hagerman Tuba(!). I might be able to get away with a less expensive iPower2 on the Hagerman and upgrade the PS to the W4S+M400 with the iPower X (and save money on the Elite). Would have to a/b the Hagerman|Elite + W4S|iPower2 vs. Hagerman|iPower2 + W4S|iPower X . . .
[Do I really want to do this???]
With the Hagerman, this has put the Edition Eleven back into competition (with the NDH-30): transformational(!). The Ultrasones sound even more exceptional, the Tuba now capitalizing even more on the Eleven's speed and detail retrieval while developing tonal and dynamic subtleties lacking with the NDH-30. Recabled with all-silver UPOCC solid core wire and the Eleven pull a bit further ahead.
(Am considering an iPower X for the Roku, too.)
Also, have a pair of NOS RCA 6BQ5 arriving Monday for the Tuba.