i have pma50 the differnt is
this device has passive & active output speakers
pma50 only passive
the max usb out put 348 pcm
pma50 only 192pcm
the dsd is the same
this have preamp for vinyl
pma50 only have aux line in
but i dont know the quality of this device
the quality of pma50 is amazing ,,,
GreatMagicianPMA50 is superior since it uses an upgraded OEM Zetex direct digital amp module from the older one used in the NAD 7050. In fact it is the cheapest yet most advanced direct digital (power DAC) amp in the market right now. On the other hand the Sprout II is comparable to the NAD 3020 being a hybrid Class D design.