Thanks.
You know what...I think that I will try the HA-2.
You will be very happy with this pair. The PM-3 sounds already very good with iPhone/iPad/iPod, but it sounds absolutely GREAT on the HA-2, when using digital connection (USB) port. I tested the pair (FLAC format) with Eric Clapton's Unplugged (Acoustic guitar and male voice), Diana Krall's Love Scenes (Piano, female voice, bass), Tori Amos (Piano and female voice), Miles Davis Kind of Blue (Trumpet), Steven Wilson's Hand cannot erease and Pink Floyd's Wall (Experimental), also with Redemption's Snowfall on a Judgment Day, Tool's 10'000 days and Evergrey's Monday Morning Apocalypse (Heavy Metal, Progressive Rock) , and, and, and much more. These spectacular products PM-3 and HA-1 from OPPO sound as good as my HA-1 paired with HD800 with any kind of genre ( I did not test Classical, exept Deep Purple with Philharmonic Orchestra in MP3)! Latter pair has a more "open space" or "wide stage", but this is subjective feeling, perhaps because of different (open vs. closed) design of the HD800. Conclusion: I fell in love with my three OPPO products. Have fun!