Probably its too obvious to be answered :-( I was waiting for this in order to have an answer from a user with exactly the stuff that I wanted to compare, and I asked it twice...   Anyway I think that I'm going for the DT990's 250ohm version, because seems my soundcard amp will drive it more...

Thanks! ;-)   And about using lower impedance source for the headphones? Can anyone confirm me that it never harms nor the headphones nor the amp? (I guess not, but I need the complete confirmation)

Well, something important is that here in Europe, and concretely where I am and after checking best price over internet (including everything), same price for 250ohm than for 600ohm (and almost the same, just a bit less, for HD 650's).   About the real difference, I will tell you why I am...

Thanks a lot for the answers!   Ok, if the 600ohm DT990's will continue sounding better*, with my soundcard, than the HD650, I will go for them instead for the 650's.   (*sounding better = someone preffering the 600ohm over the HD650, will continue prefering them)   All was because I...

Thanks for the comments! But hum, there should be a way of knowing if the power is enough (ok, having a good sound or not no, but at least to be able to know if "theoretically" an amp has enough power to move the headphones -even when is not only about giving X peak power in a moment, but to...

I opened a thread before because I was thinking of getting the HD's 650 or the DT 990. But I changed my mind after reading about the HE-4. The problem is that even being a pretty low impedance cans (38 Ohm), they seem to be pretty hard to drive properly. More concretely I've read about the Fiio...

So you think the 330ohm card will be able to drive without too much difference the 600ohm version of the DT's 990? (without bass issues) If that's the case I think that I would go for them and after some time be able to get a proper amp... :-) 

  I don't want to start a new thread from scratch in order to discuss about Senn vs DT cans in general, don't worry :-). The problem is that my headphone amp (a Soundblaster Titanium HD soundcard) has "just" 330ohms, so I cannot go for the DT 990 600ohm version as in principle I would like...

Sorry, it shouldn't go here. Could any admin erase this message?

I don't want to start a new thread from scratch in order to discuss about Senn vs DT cans, don't worry :-). The problem is that my headphone amp (a Soundblaster Titanium HD soundcard) has "just" 330ohms, so I cannot go for the DT 990 600ohm version as in principle I would like.   I read a...