Unfortunately when I go to more "hard" sounds I loose clarity and bass. For example Kyuss - Demon Cleaner sounds even a bit muddy at some points
I've got admit that Kyuss has some of the muddiest-sounding recordings I have ever heard regardless of what I listen to them through. I've always loved Demon Cleaner as a song, but it's really not a very clear song. It is stoner rock and hence the Fuzz guitar effect is almost constantly used. And as you might have guessed by its namesake, Fuzz makes things.... fuzzy. It can intrude on everything. Apologies if you know all this stuff already.
I would say that you may well need to burn them in a bit longer, but I honestly find the S500 bass can be a little flabby (for me) sometimes - but overall its sound signature is not mud.
Interesting that you mention the synergy with film because I've always found that the strongest point of these 'phones regardless of having the ELE or not.
EDIT: Give this song a listen: http://www.youtube.com/watch?v=9iWyCBMcZEk&sns=em (try find it in better quality if you can). I was always struck by how clear-sounding that song is (to me). If it sounds muddy to you, then... I may be very annoyed when my ELE arrives . Their song "Diokhan" is also a pretty interesting listen because it's a rather busy, layered song. Lots of vocal tracks, interesting guitar. I can pick the individual elements in it very nicely, so hopefully you can too.
Edited by hatefulsandwich - 1/6/13 at 2:00pm