I have been searching for a good pair of headphones for awhile now. I wanted to upgrade form my XB700's so I ended up gong with the Pro 900's. I wanted a good all a rounder that still maintains a good bass signature
I really enjoy the sound signature over my XB700's at the right volume, the highs are nice and bright and the mids are really nice too. I couldn't really hear any mids in the xb700's because the bass drowned them out.
The bass is nice and tight and has a little sub bass but I must say to anyone who ever thought that these even came close to sounding as deep as the XB700 needs to get their ears checked lol. With that being said though there is a 10mm difference in driver size so it makes sense.
There are frequent occasions when I like to blast my music whilst at work when hooked up to my Mangi and a 9 band EQ, these seem to distort at very high levels where as the XB700's didn't really do that to often. Anytime there would be a big bass drop with like DUBSTEP and RAP the highs in Pro 900's would sound like you're speaking through a fan that's turned on. As far as New Age and Vocal type of music like Enigma and Loreena Mckennitt these Pro 900's blew my XB700's out of the water, they just have an overall better soundstage and I think its the mids that did it for me there.
Overall I am satisfied and may try to get some leather pads on them, I hear that helps with the bass some (which makes sense cause they'll seal much better). I would try the kees mod but im not to sure that will do much in the bass realm, It looks like it does more for the highs as far as not making then pitchy (by muffling them) which some people have complained about.
That is my review, im sorry its not as detailed as others in the audiophile world but im still a newbie and ill catch on :)