Hey, the HA-2 even does an amazing job with the LCD-2 rev.1 (not to mention the PM-1, PM-3, and HD800.) I don't have a lot of headphones compared to some people, so I'm not trying to take anyone on a tour of my profile, but the fact is those I've just listed all sound great on the Oppo HA-2.
The HD800 amazes me the most, because it's incompatible with so many desktop amps that I bought and sold, yet not only do I like the way it sounds with the HA-2, I actually prefer how the HD800 sounds on the HA-2 to how it sounds on the Oppo HA-1 desktop rig, single-ended or balanced out. The HA-1 is king, however, for the inefficient LCD-2 rev.1. Those two are married for life.
In truth, even though the little HA-2 competes well against his big brother, beating him with the HD800, I can squeeze out noticeably better dynamics, with a only a slight loss of transparency by taking a Line Out from the HA-2 to an iBasso PB2, as shown here:
And while I'm throwing the HA-1 under the bus (neglecting to sing its due praises) I'll add that the HA-1's USB receiver is every so slightly grainy compared to the ultra clean USB input of the Oppo HA-2, with every USB source I've tried, including my cleanest - an iPad 3 with CCK > UpTone Audio USB Regen.
iDevices for streaming Tidal Hifi, USB from a Sony Walkman for my FLAC collection, or USB from a Win7 laptop for Tidal or FLAC, I frequently switch between sources and headphones with the HA-2 and it always pleases.
HOW did you make that hirose to 4 pole xlr pigtail? Im trying to make the same and am stuck on what wire goes where.