For me the the bass is lighter than all the other flagship ive heard. Including T1, LCD2-3-x-xc, HE500-6, hd800, dx1000, d7000, th600-900, sig dj, ps1000, k812
In my book they are the only closed rival to current open flagships (HD800, T1, LCD-3).
TH900, Alpha Dog, DX1000, Sig DJ are also in the upper end with the w5000. I prefer all 4 to the w5000 I heard. I couldnt justify w5000 getting them when I have t1 + hd800.
I will say they are one of the classical closed choices though.
The bass thing, I certainly do not hear it weaker than HD800 or T1, in fact doing A/B with HD800 right now on AURALiC stack and as far as bass amount goes they are almost identical.
May be I am one of the lucky ones achieving proper fit with them, I had to bend headband a while back to get there though, or just have matching system.
Out of amps I've tried with them, GS-1 with Dynalo+ modules and AURALiC Taurus MKII, esp the latter, drives them the best, with the fullest and the most authoritative bass.
As far as other closed go, the best that I've owned and can comment on are Mad Dog 3.2, Sony MDR-7520, D5K (modded), TH600, and to me as far as technical abilities go like resolution, imaging, sondstage, bass texture and control, nothing comes close to W5000. They also quite easily outperformed LCD-2.2.
Some may find pronounced midrange too much to their taste and prefer something more neutral, but this is pretty much ATH trademark, some like it, some hate off the bat and nothing on earth can convince them otherwise.
If you can
really audition them, as live with them for a day or so, not just short A/B as they as few other cans need some brain burn in time, that would be the best. Find retailer with a good return policy or get them used so not to lose much in case of resale.
These days in home setup I am using balanced HD800 almost exclusively and turn to W5000 in case of my family or myself need some isolation. On my setup and to my ears they are almost perfect closed compliment to HD800.