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Not sure whether I should pick up a pari of dt990s (not sure whether or not from Massdrop) or wait for this drop again. Any est. on when this might drop again?
DT 990s really need a decent amp to get a good performance. k7xx also need amp, but not that picky seems to me. DT 990s does sound great.
The version of the DT 990 that is dropped is the 600 ohm version so you need a serious amp to drive it.
I've owned the DT990s (I own Senn HD650s and a pair of MrSpeakers Ether). Let me just say that the K7xx is better (to my ears) than the DT990s in nearly every way.
Other than build quality, the K7xx beat the 990s in all other aspects (ie. all aspects of Sound quality). These are some seriously nice cans, I am impressed.
Would an O2 desltop amp be able to get a good performance from DT 990 600 ohm?
I think I have check the output max power of O2. For 600 ohm headphone, it seems not very powerful. I haven't try it and I don't own 600 ohm. Numbers don't determine everything sometimes, but it does play an important role. I suggest you find more review (with high resistance headphones of course) and search other better option. Since I don't own one, I am sorry that I can't give you any specific suggestion.