At this point, I use the headphones to 80% mobile for music and 20% at home for music, movies and other computer work. Mobile use: iPod, iPhone, iPad without extra amplifiers; home to a 200W receiver of Technics.
After a short warm-up period (Yes, headphones can not hear after 2 minutes as described as good or bad; it takes quite a few hours), they unfold their full potential and I, as an acoustic fanatic am very pleased with a wide frequency spectrum. Deep, warm bass, crystal-clear highs and a powerful middle ensure balanced listening pleasure (classical, electric, rock, jazz).
And with almost ridiculous 70. I've listened expensive alternatives, other Sennheiser models, which have been specifically touted for mobile use and none of it has convinced me more. Neither Beyer Dynamics, even Sony, AKG, "Beats by Dre" and the rest of them were able to convince me.
To improve this, if you like the model example of Bose buys, but there just made me the high price deterred. But who can do without noise and ambient noise reduction, which is well served in my opinion, with the HD449. Especially since the closed over-ear design almost nothing ranlässt to the ears what you do not want to hear!
At this point, however, I would like to issue a warning: The headphones seal so well that vehicles approaching not penetrate into one. In an experiment on himself not even a horn or a siren. Mag one hand be good for pure music listening, on the other hand extremely dangerous on the road. So if you prefer dancing on the street than to go about it, should be better around 5 times before he does this or simply short put the headphones.
Otherwise, the headphones can safely several hours at a bear (an eight hour flight with no complaints), without pushing. Sure, in the summer to catch before the sweating, this one has in the winter excellent and chic Ohrenwärmer: D
For me, the HD449 is the ideal combination of price and performance, for the demands that I put on this device; always with regard to the use of distribution (mobile 80%; 20% home)