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600 ohm sound cards are kind of old news, they've been around a while now. I have the Asus Xonar Essence STX which is rated for 600 Ohm headphones, and combined with my very expensive Beyerdynamic headphones which are rated for 600 Ohms, I experience severe pain in my ears once the volume goes above 50%.
What I don't like about Creative is how they keep shying away from 1/4 inch headphone jacks, as very few of their cards, even high end ones, don't have them. Almost all high end headphones (and no, anything Beats by Dre is NOT high end) don't have 3.5mm jacks. It's stupid to have to use an adapter.[/quotemsg]
I use the same Stx card, but I pair with the HD 598. I don't think it can drive much more than that. And I'm 100% sure this thingie from creative is far from powering up 600 ohm headphones.
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I previously had a pair of Sennheiser HD 650s paired with the STX card, and the difference when I hooked up the Beyerdynamics and set the gain on the sound card to the extra high gain setting for 600 Ohm headphones was like night and day. If you think they can't power much more than that, you really should get a 600 Ohm pair and see for yourself. Even reviews on high end audio review sites have all confirmed that the STX can power pretty much any pair of headphones out there, save of course for electrostatic headphones that need their own transformer.
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Well then, that's good news for me then. I was thinking about going for Audeze LCD 2 (3 is too damn expensive). Seems like there won't be a need for an external DAC/Amp