I'm not a headphones guy. I'm a speakers guy. I've never found any headphones that came close to a speaker setup with a carefully equalized response and good room acoustics. I was kind of surprised Oppo chose me for their beta group, but after I started working with them, I figured out why they chose me.
I work in the entertainment business, and I've supervised recording sessions and sound mixes as part of my duties. I always admired the quality of sound I heard in first class recording studios and mixing stages, and wanted to recreate that in my home. I would ask the head engineers at the studios questions to find out what it would take to achieve that and filed the info away in my head for when I got a house where I could build a first class listening room.
I recently got that opportunity when I moved into a new house that had a room that was absolutely perfect for a screening room/listening room. I assembled a first class set of speakers and spent about four months carefully EQing and balancing the levels by ear using acoustic music. The goal was accuracy and realism... a stone flat frequency response
i kind of took your post as advertisement at first so i had to question. I see now what you're talking about. Sorry. Oppo appreciated that over time you found that speakers need a flat response to sound accurate (basically the definition.) Then they had you measure them for them right?