I measured the Ferrum Wandla with my Audio Precision SYS2722 system (see the January 2008 "As We See It"). As HR had told me he much preferred the sound with the optional Ferrum HYPSOS power supply, I performed a complete set of measurements using that supply (set to the appropriate 24.0V), then repeated some of the tests with the wall-wart.
Looking first at the Wandla's behavior as a D/A processor, Apple's USB Prober utility identified the Wandla as "Ferrum WANDLA" from "HEM" with the serial number string "12 mb=HEM014964;serce=HEM015368." The USB port…