I measured the Ferrum Wandla with my Audio Precision SYS2722 system (see the January 2008 “As We See It”1).As HR had told me he much preferred the sound with the optional Ferrum HYP-SOS 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 operated in the optimal isochronous asynchronous mode, and Apple’s AudioMIDI utility revealed that the Wandla accepted 24 and 32-bit integer data sampled at all rates from 44.1kHz to 768kHz. The AES3 and S/PDIF inputs accepted data sampled at rates up to 192kHz. HR had told me that he
