I would simply suggest listening to this headphone. There's a reason I bought up this video before... ...and that's because I believe this video was made before any measurements of the HD820 were posted -- this is important given the influence of measurements on impressions/opinions. I've watched this video a couple of times, and they're mostly comparing it to two of the most well-regarded open-back flagship headphones (HD800 and HD800S), and still this close-back holds up well to them (and to me). The HD820's was a carefully crafted signature, and it's more unusual to look at than it is to hear. If you watch Lachlan and Eric's video (above) they both recognize the bass (which some people upon looking at the graph alone would think must be boomy) but don't complain of boominess or muddiness (quite the contrary actually). They don't complain of an egregious, unholy suckout either. Paul Barton's RoomFeel is not the same as the Harman AE target -- even if you're a fan of either (or both) of those targets, headphones based on either won't appeal to everyone. The HD820 represents another target, and was most certainly not arbitrary. The team behind it is one of the most experienced group of headphone engineers I know of. Stop staring at the measurements -- whether mine or anyone else's -- and trying to come to firm conclusions based on what you see. We have one of the most sophisticated headphone measurement systems I know of here at Head-Fi HQ, and I stand by our measurements of this headphone as accurate. But this is a headphone that must be heard. There are reasons for what you're seeing in our measurements, and the results are compelling. The HD820 is, without a doubt, a remarkably open sounding referenced closed-back headphone. (Of course, this is my opinion, and there won't be unanimity on this or any other headphone.) I remember discussing the Harman AE target with community and industry friends when it was first shown, and many expected it was going to be too heavy sounding for audiophiles. While some of course will feel this way -- because preferences vary -- many (myself included) do not think the Harman AE target (or the even heavier Harman IE target) as overly bassy. There's still work to be done on targets, and it's being done. There will never be only one.