Most customers that have tried both say that they prefer the U2 Async. It's hard to say exactly how big difference you would experience on your system. They are very similar and have the same sound signature, so the difference wouldn't be that big.
almost 6 years ago
This is my first thread.
I am planning to buy DAC so that I can play music (iTunes) from my laptop (Mac). I have Polk Audio T15 Bookshelf powered my Lepai 168HA 2.1 Amplifier. Currently I am playing music from my mobile phone through 3.5mm to 2 RCA cables. So I would like to know how much sound quality difference will be there between Sync and Async USB.