thanks for the answers! I don't know much about this kind of stuff. And one more question, if I were to get the a40's, could I get a Sound card instead of getting the mix amp?
Both of these brands seem to be very popular and i've heard good things about both. I will not be buying the mixamp version of the a40's, just the headphones. The Sennheiser's are about $139 and the a40's are about $150. I want them to be comfortable, good for gaming, maybe some music every now...