I'm happy to see Tyll's measurements on these. I'm curious which setup this one corresponds to (most likely one disc).
I've compared Tyll's frequency response of the Alpha Dog to some other measurements in his database and find that the Alpha Dog's matches that of the pre-fazor LCD-2v2 quite closely except for the very extremes. The Alpha Dog has a bit more mid- and sub-bass (+4dB or so), and the Alpha Dog rolls off after 10kHz -- these are the two main differences. The midrange and lower treble of the Alpha Dog is close to all of the Audeze offerings, in fact.
I also call your attention to the graph NEXT to the frequency graph -- the one titled "Isolation". That curve is one of the best in Tyll's database if sound isolation is your goal. In fact, it rivals the Howard Leight Sync which is a passive-only isolation-first headphone with a ragged frequency response (although the Sync does isolate better in the midrange). Two thoughts come to mind: 1) With a little DIY electronics, the Alpha Dog could turn into an incredible active noise cancellation headset from an acoustic isolation point of view (not saying anything about the sound -- usually such systems mess up the system fidelity IMO). 2) Even without any active noise cancellation, the Alpha Dog is a great isolating headphone. It makes me think I should take it to the racetrack the next time I attend a race. The size of the headphone is not a problem there, and the automotive paint would even fit the venue.
Edited by jazzman7 - 6/30/14 at 8:26pm
EDIT: I just checked the difference, and Audeze LCD-2 ver 2 and Alpha Dog come to within +/-4dB of each other from the subbass to 10kHz -- and this is without any measurement smoothing on Tyll's data. If smoothing is applied, I would think the difference would fall to within +/-3dB, which many would recognize as the old-school similarity tolerance for frequency response. When I first heard the Alpha Dog, I told Dan that I don't think it needs any EQ. Given that my own sonic signature preference falls squarely within the Audeze camp, now I have some confirmation as to why. I have both of these headphones, I listen to both, and I keep the EQ flat on both.