It should be noted that W5000 has high quality bass while for example w3000anv does not provide you with that level of definition altough you will hear more low requencies. Best test is bass guitar where at least myself cannot hear string details on w3000anv while it is present on w5000. I encourage everybody to try round insert inside leather pads. Totally reversable and in fact you might be quite surpriced. It is not my mod but do not remember the name of iventor. My modification is that instead of rubber tube i'm using synthetic rope which provides some dumping i believe being clean and not prone to any deteriration. The only drawback i cannot find this size of robe in dark color so it looks slightly funny but barely noticeable really. I have done the same mod on 3000anv but results are not that obvious mainly due w3000anv pads being smaller.
I would say that the W5000s have some of the very worst bass I've heard for any headphone (regardless of price)...again:
YMMV of course.