Hi mate (Bodgy) I own ws99 and your tune sounds pretty enjoyable on them, the subbass is definitely well present and tight, but its not like GIANT or anything. Bear in mind, these cans are NOT flat, I listen mainly to drum and bass, more specifically neurofunk, which is pretty audiophile-y genre as far as edm goes, and listening to it with no eq (no external dac or amp either) left quite a bit to be desired in the low subbass range, as well as the high-mids and upper high range as well (snare "clack"s were somewhat pulled back and overall sparkle was not there). It sounded a bit too mid-y as well, which was enjoyable for some tunes but for others not so much, especially at higher volume. And then later I dug out a frequency response graph and I knew exactly why. Annoyingly I can't insert an image right now so I will describe it as best as I can:
0 db at 30 hz descending to -3 something db at 20 hz;
then a big bulge at 50-100hz (+4db) which is my guess why the low subbass seems somewhat pushed back in comparison;
then a gradual descent to quite the dip at 700 hz (-3db),
then a "mountain" from 800hz to ~1,8khz peaking at 1 something db - hence the middy-ness,
then a big ass dip from 2khz to 7khz, reaching -7,5db! at 3khz, which was producing the lack of snare (and vocal) brightness,
then a peak at 8khz (+~2.5db)
and a dip at 15khz to -7something db again, which is the cause for the lack of high end sparkle.
That said I installed AIMP player because of the more extended eq (i.e 30hz slider), and to the best of my ability made a reverse eq based on that graph, brought the preamp down then SLAMMED the bass boost DSP, and let me tell you once the cans were brought closer to flat response plus the bass boost, sound became pretty accurate and bright with quite the monstrous sub bass with no perceivable distortion or mudding of the other frequencies. My point is if you are willing to fiddle with the sound these can perform very well for bass music genres, but are not initially tuned well for them.
For production (I know, I know, production no-no on headphones, I'm a noob) I made a far more accurate reverse-eq and put it on the master, then I turn it off before exporting and this definitely helped, otherwise the mix I was doing was wrong as ****.
Otherwise these are fast, have good detail, narrow (intimate) soundstage, the driver grills are slightly pushed against the tips of your earlobes so you can get ear pain, yada yada you can see the reviews.
PS Just now I saw that InnerFidelity has posted measurements ( http://www.innerfidelity.com/images/AudioTechnicaATHWS99.pdf ) so you can check out those as well, they slightly differ to what I described but are mostly the same, just pushed down some decibels for some probably technical reason I don't understand.
Edited by Aeson - 6/30/15 at 1:15am