I OWN THIS DAC THE SOUND QUALITY IS SUPERB IT, ITS DUAL MONO WITH 2 DACS AND 2 TORROIDAL TRANSFORMERS IN BALANCED CONFIG URATION WITH HARDWARE UPREGULATION TO DSD OR PCM 384 THE PC APP/ PLAYER IS STABLE AND SOUND QUALITY IS BETTER THAN JRIVER BUT LACKS OTHER FEATURES, THE ANDROID APP IS STABLE AND RARELY CRASHES OVERALL THIS DAC HAS SUPERB BASS AND DETAIL WITHOUT HARSH TREBLE , BUILD QUALITY IS FANTASTIC , BUT IS THIS DROP FOR 230 VOLTS/ WORLWIDE VOLTAGE
rizkaziI have the 501, if you have not changed the stock power cord, try the Pangea Audio AC 14XL MKII power cord you will be amazed at the reduced noise floor and improved dynamics. I will put a link below, read the description and testimonials...
http://www.audioadvisor.com/prodinfo.asp?number=PGAC14XL2&variation=1
rizkaziAccording to the specs published by Massdrop, 220V to 240V operation is supported. But they claimed this on the last drop too and then were not able to deliver.