Anyway...those Sennheisers sure are expensive >_< Also, I intend to also listen to them at school and in the streets =\
That means a couple of things:
1) They shouldn't be all too big and heavy
2) They simply have to be closed, or I won't be able to ever listen to it properly
3) It would be a shame if I'd lose € 700 Grados ;p (or lower-but-also-relatively-high-priced-headphones for that matter)
4) It needs to be able to be driven by a regular discman, iPod or minidisc (is that about impedance in Ohm(resistance)?

The headset can wait, but although I'm definitely going to get one of those (since my current headset was damaged by a friend, causing the left side to be totally silent), I definitely want one for music and on the street first.
*sigh* it's all so hard ;p
Anyway, would it be possible to use a Sennheiser 497 on a discman, mp3-player, iPod or minidisc (and other similar products)?
Does anyone know the max. amount of Ohm impedance a headphone can have for most portable players to still be able to drive it?