Thanks to Godkin's review/advocacy and comments from other owners of the DV3322, I decided to buy one. At the moment I only own the HD-650 and AKG 702, and a Shanling PH-3000. The DV was bought from Boyier and was a fast and happy affair. This amp is a handsome animal and feels like a solid piece of gear. The double gain controls are great to have and not a bother at all.
Having read that the 3322 needs substantial burn-in and a change of the Chinese tubes, I approached the fast hook-up-and-listen 1st session with trepidation. Interestingly, with the HD-650, it sounded quite wonderful--right away! Full, spacious, good timbre, and all with the stock tubes (bought some NOS tubes, but later on those when I actually use them). The AKG experience wasn't pretty, though. However, in all fairness, the AKG is still a newish item so it's still in a burn-in of its own. Hopefully tomorrow, I'll be receiving a new toy from TTVJ--an HD-800 (impulsive buy but with a 30-day return policy). I haven't read much information about the synergy of the 3322 with the HD-800, so if anyone who has this pairing could write something here it would be much appreciated. (Hey, I know it looks silly on paper that one is 3x the cost of the other, but I am an optimist. The success of the 3322, so far, with the HD-650 made me feel that the 800 could mate harmoniously with it. We'll see.
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Being quite new at this headphone affair, I'll wait to post further on my experiences with the present system. I listen to classical (solo instrumental and orchestral) and acoustic music of different genres. Having had the DV now for 3 days, I can only report that this is a very worthy amp for all my music. Even the AKG now displays good musicality and--gasp!--well-rounded bass.
Comparisons with the Shanling (a damn good amp, by the way) will be interesting as that amp ran the HD-650 with authority and musicality. For this headphone I do have a very nice Double Helix cable that is a pronounced upgrade from the stock.
I have no affiliations with any of the dealers I mentioned above. I am simply a satisfied customer. Thanks to all members here for your helpful suggestions.
Gear information:
The DV3322 mated to an MHDT Paradisea 3 DAC (WE 396a tube) using Ridge Street Poiema!. A Trends 10.1 USB converter connects to the Paradisea via a pricy Virtual Dynamics coax and the Trends to a Macbook Pro with a Locus Design "Axis" cable. All power cables from VD ("DV, meet VD") and line conditioning by Richard Gray. All music on the Mac derives from AIFF files (no MP3) and also FLACs. For SACD, there is an Exemplar-modified Denon 2900 with older-model Pure Note ICs. At the present time I'm limited to only headphone listening so I haven't used the preamp outs of the 3322.