I prefer the DJ to the TH600 overall. I have yet to hear Sig Pro however. The TH900 is not in the same price bracket either.
The TH600 for me seems brittle and not as engaging as the Pro. I will openly admit 50% of my listening is electronic mainly psy-trance, Goa trance, industrial stuff DnB etc.
Looking at your profile I can see why you make the conclusion, your mainly a rock dude. Yeah I don't rate the signature DJ as a top rocvk performer either.
Interesting. I absolutely love my TH600s but I keep craving the Sig DJs atm... have to try them at some point. I think the TH600s are phenomenal with all kinds of electronic music. Soundstage, comfort, detail and sub bass are absolutely perfect IMO. I don't feel the mids are recessed either but I'm not one to focus on mids. The only area I sometimes think could be improved is the mid bass punch and i'd imagine that's where the Ultrasones excel, hence the difference between them (and the great isolation with some soundstage loss being the tradeoff). As long as the highs aren't too shrill/piercing like I remember the Pro900s being but I've heard both Sigs are completely different so I doubt it.
Either way, gotta get a pair of these soon. Just moved into a shared office spare for my freelance work and I don't think my TH600s will cut it for blocking out noise of office music and coworkers when I need to. Plus they'll leak all over the place if I crank them. M100s are fun for commuting but I always miss the clarity of better headphones (and again kick drum punch, they're bassy but a bit muddy). They also get hot on the ears after long periods even with the more comfy XL pads. So SigDJs could be perfect. I just wouldn't DJ in them because I'd be too scared of losing/wrecking them :P
Edited by designbykai - 4/8/14 at 6:26pm