I own the HS50's and I'm quite fond of them. The only problem is that they don't go below 40hz, but it's not that much of a problem once you get to know things and use your headphones a bit.

I own them too since 1 year, they are great, very accurate. Same remark about the low frequencies. HS10W ...

Hello from France !

Sony MDR7509HD are ultra precise in low and high frequencies, very flat. The stereo image is great too. It's a kind of audio "magnifying glass". But they are closed, after a 2 or 3 hours you must make a little break.

Hello by the way, it's was my first post here !!!

The deepest and dirtiest bass I've heard from a soft synth (without any additionnal effects) came from Blue (Rob Papen).
Blue + any distortion + a filter (Quad Frohmage or Filterscape) is a killing combinaison.