ok, lots of questions and comments.
As for Steve Guttenberg's review, I gotta ask. Has he ever given anything a bad review? I think he might my the most optimistic reviewer I've ever read.
As for the cables, can anyone comment on the basic $66 Z7 cable from Surf Cables? Yes, there is a 30 return policy (kudos), but a review would be nice. A comparison between the stock cable, the $66 cable, the ~$150 surf custom silver cable, and the kimber would be awesome. Measurements would be even better.
As for getting a 150 or 250 cable for the Z7s to tame the base and resolve the treble a little, that makes we think about the price. $699 for the cans plus $249 for a cable, not your talking ~$950. At $950 one has to consider a whole new class of headphones like a Alpha Primes, used TH-900 or Ultrasone Signature Pro. Used the Z7's are going to ~400. Adding a $250 cable and we are back at 650. There are so many options for a closed headphone at ~$650 (EL-8, AH-D7100, Slants, TH-600, Alpha Dogs, and Blackwoods). Then there's the Shure 1540, the Oppo PM3, various Audio Technicas, The T70 (if you like brrright), Focals, M&Ds, more Ultrasones, and a few Yamahas. I'll bet I missed some too! My point is back to the cable. If one needs a $250 to make the cans sound good, then one has to compare that base price plus the cable to others.
Finally, what about balanced vs single ended? How does using the stock balanced cable sound vs the kimber single or surf silver?
Too many darned choices!