After getting these for my daughter,
I knew I wanted a pair.
I just bought these for a great price at Radio shack retailer ($129.99).
I have zero issue with the treble.
I would have to say that these are much better than other recent offerings by other manufacturers.
In that the others mask their highs and rolloff the highs so as to avoid any sibilance in the highs.
I would look into why you are not experiencing decent highs.
I would go as far as to return to vmoda to see if anything wrong.
These cans, to me, have all the treble that other cans this price range don't.
The resulting sound is more realistic .
I don't actually own the M-80 yet, but I listened to a pair for quite a while using my own 320Kbps MP3 files of music that I know very well. Compared to other high quality headphones I've owned (various mid- and top-level models from Sennheiser, AKG, Beyerdynamic, Grado, etc.) the treble of the M-80 was clearly rolled off. (From reading all the reviews, I'm apparently not alone in that view.) I can understand why a headphone maker might want to
slightly tone down the treble, but the M-80 went beyond what I'd consider an optimum amount of roll off.
I read somewhere the V-Moda CEO Val commenting that he designed the M-80 with deliberate treble roll off to help users preserve their hearing. That sounds to me like rationalization. (That's not a bug, that's a feature...) If he created this degree of roll off intentionally, then IMO, he overdid it.
Just saw the graph & they look pretty consistant all way to around 15khz.
Most users will not hear past 16khz.
The issue that I have with the M-80's treble isn't the response beyond 15khz, it's the steep drop off of about 10db at 10khz (as you noted in one of your other posts).
Anyway, the form factor and build quality is so good that I really
want to like these headphones. Anybody ever try a silver cable or silver-plated copper cable with the M-80?