Couple of reviews more.
By far one of the best cans at middle level. Comfortable fit. Wide, very wide soundstage (for closed headphones). Powerful bass, but alas not well controlled (bass kin of hang out on the wide soundstage). Highhs may become too bright on the bright DAC/amp, no complaints on the on a neutral or dark gear. Overall a bit too sweet sound character, has a tendency to embellish, to apply "Photoshop effects" to sound.
Death: A sea of fun! I’m not sure, that Death should play soy joyfully, but when D600 play – they generate the most diverse emotions. Thanks for that.
Black: Well measured heavy bass (unlike on a number of other sub-genres) – the key to success.
Doom: Technical potency (yes, yes, again it’s about of volume of bass, albeit imperfectly controlled) coincides with the profile of the genre. Yes. They play doom. Savory.
Sludge, Stoner: Despite the overload on the bass, potentially unacceptable, D600 play Sludge/Stoner with more enthusiasm than their colleagues headphones on middle level.
Power: Probably the best cans for Power on the middle level (may be except AKG 712). Moderately lightweight and cheerful sound signature, nice midrange. Swollen bass is trying get in the way, but fortunately it fails to spoil the feast.
Symphonic: Slightly too brutal, but fun and cheerful anyway. Unintelligent, but entertaining interpretation of Sympho-metal.
That turns out not too well:
Thrash: Amorphous, bulky, slow. Characters of cheerful songs rotate in a tank with oil, wrapped in a soft protective shell…
Progressive: Fat and lard, looks like a greasy pan. Repulsive.
Alternative: Bass excess confidently leads the brain into the overdrive.
Overall, despite the impressive and apparent viability of a broad range of metal subgenres, D600 remain extremely non-neutral, non-flat and son non-universal headphones. Initial enthusiasm, if you are not full bore, is practically guaranteed. But how this enthusiasm will last, is much more difficult to say. Alas, for the cans with this level of "curvature", chances for close boredom coming are far from zero.
Denon AH-D2000 (padauk cups mod)
Bad guys (in a good sense) even against “not so good guys” colleagues)) Mod consists of 1) replacement of the cups - padauk cups installed and 2) tonal balance adjustment by sound absorbing material application. Result – very bass-heavy and heavy-weight headphones (probably another reason for gestalt response with heavy metal genres). Bass is powerful and well-controlled. Denon X000 drive is in place. Mids, alas, are imperfect, a bit recessed as compared with original D2000/D5000. Soundstage is narrow. Highs are quite acceptable.
Black: Dark, dense and comfortable. Feels like Alien’s larva rotating in the mucus in the parent shell.
Doom: Ununexpectedly great. With such a bass it can not be not great.
Heavy Metal: Wood consonant to live (at least relatively live) genres. Another confirmation.
Industrial: Wooden sledgehammer gives lessons of Industrial with a human face. (Key point - concentrated bass hits right to the spot).
Thrash: Moderately natural and immoderately involving. Bass - exactly what you need, ample but well controlled and concentrated.
What’s not so good:
Symphonic: Not their day (genre). Narrowish scene and pluses (fat bass) become more outs.
Progressive: Alas, sheer lack of subtlety, delicacy and space.
Goth: Instead of light melancholy we have boredom here – looks like Shrek is in sadness.
In total, one of the best cans for the metal. And once again, not too versatile / neutral headphones. Love / hate test is presumed.