Had fun meeting and hanging out with you guys! If I'm a bit, eh, harsh on any criticisms, don't take it personally. Just my brutally honest take, and all of this is personal preference.
You were all great regardless! And I know not everyone liked all my gear, and that's cool!
MisterRogers's HD800 + EC Super 7 - Gotta say, this stock HD800 sounded pretty darn good out of the S7. My main criticism of the HD800 is the somewhat lean sound, at least from most amps. I say most amps because this HD800 did not sound lean whatsoever from the S7. Nice impact and a full-bodied sound. Treble still had that weird etch to it, but overall it was actually quite enjoyable. Enough so that it comes to mind first. I'm going to have to get an EC amp for my HD650. It still doesn't make me want to keep my HD800...650 is much better for my ears. But this was nice, no doubt about it. I thought MisterRogers was full of crap when he told me to try it out after I mentioned the lean thing ("Try this, it isn't lean."), but he was, in fact, right on the mark.
ATH-R70x - This one was a mostly positive yet slightly mixed bag for me. I thought it had a tastefully warm and full-bodied tone. Kind of like an HD650 but with a broader sense of warmth (i.e. not so focused around that 100Hz area, but spread out). Rest of mids and treble were nicely balanced for that pleasant sort of somewhat dark tuning. Really nothing offensive and quite enjoyable with just a slight hint of upper mid or treble oddness (again, very slight, almost not noticeable - the stock HD600 and HD650 aren't perfect either). Problem is the headphone didn't sound particularly hi-fi like the HD650. Checked every box but that. Doesn't seem to scale as much. Also, ear pads were kind of hard and small, being somewhere between on and over ear. So, while overall it was quite pleasing to listen to, I can't think of any reason why I'd not just get the HD650 instead. I liked this better than the K7XX at least.
Alpha Prime - My first thoughts were that it sounded...weird. Tone and overall response, detail, soundstage, all that seemed OK. But you know that sound you get when you don't plug your headphones in all the way? Kind sounded like that. Very weird. Just something unsettling about it. And, yes, I quadruple checked to make sure I had it plugged in right! Placement was too left/right and yet not at the same time? I know, makes no sense. This headphone just didn't make sense to my ears. HOWEVER, someone later informed me the pads were on backwards (yes? no? can anyone confirm?), so I honestly can't say for sure if I listened to them backwards, completely, or with the pads flipped around. I'd like to say I'm not that dumb, but, eh...maybe I missed it when putting it on my head. Still, something sounded quite off. I didn't have a chance to go back to them, so given what I heard about the pads, could be totally off on my thoughts.
HD700 - Honestly was not as bad or bright as I expected based on what I'd read about it from guys I trust. Inherently warmer and bassier than HD800, it would seem. Treble emphasis, not quality, seems about on par with the HD800, just with more etch to it. But overall hi-fi sound, well, just is not there. I'm finding it hard to justify a purchase of this unless you want a pseudo-HD800 sound with more bass and less of the technicalities (even compared to HD600/650) for a cheap price.
EL8 Closed - Bass presence was the only thing I thought was OK about this headphone. Even then, the bass lacked picked and texture. Mids just seemed thin and dry. Treble was exaggerated and rough sounding. Not particularly good, IMO.
ATH-MSR7 - I was interested in these after reading Tyll's review about their precision and detail. They just sounded weirdly U-shaped to me, with the standout trait being rough, harsh, and exaggerated treble. Bright. Hard to really get a feel for them because of the brightness. Not a fan myself. The guy who had them, ASR I believe, said he likes bright, so it was perfectly understandable to me why he'd like these. When you look over and see my HD650 + modded PM-2, it's probably a no brainer why I didn't care for these.
SRH1540 - These were about exactly what I expected based on Tyll's measurements. Bassy, dark tilt. Sort of like the Fidelio X2, but with much smoother treble. Honestly, for the sort of "fun" sound that isn't particularly treble happy, these were quite enjoyable. The problem is that they weren't very hi-fi sounding. Sorta like the R70x in this regard (not tone), but probably even less clear sounding. My guess is distortion levels and CSDs aren't superb. Not bad, just not that real hi-fi tier sort of speed and low distortion. Then when you consider the price point, it's a pass for me. Maybe with mods it could have potential...but I ain't risking that purchase myself.
LCD-3 - Honestly, not crazy about these. Not as dark sounding as I expected. Rather neutral if anything, just the treble was rough sounding. Sounded like it had jagged treble. Not exaggerated, just jagged. Sort of middle of the road in terms of speed and tightness overall. Small soundstage with a large, sorta in-your-face sound...i.e. almost too enveloping and overwhelming at times. Really, not as bad overall as I'm making them out to be. Just not as good as I expected, especially for the price.
HE Jade - I only listened to these briefly on a song I had never heard before (closely recorded female vocals with a little bit of backing guitar, IIRC), but they seemed pretty nice. Decently articulate, clean, black background, balanced and slightly lush response. Again, not my gear, not a recording I was familiar with, but cool nonetheless. I would have loved to try these with my own source. The rare aspect of them is cool!
HD650 w/ Custom Wood Cups - Hard to go wrong with an HD650. I liked the cups on these! It would have been cool to compare stock against this, as my pair is modded, but my brief exposure to these was positive.
I'm probably forgetting something too for the time being.
Big thanks to ASR for organizing this!