Hello folks, i recently bought ath m40x headphones. They are really good, but i expected a little more from them. Sound is good and clear, however i think they should be just a little more bassy(if that is even word). So i thought of buying dac. Will it help me? The one i am looking at is asus xonar u7. Is it good? Will it make ath sounds better? Should i buy dac or new sound card? And also, how is dac working? Do i just plug it in usb port or whatever and that's it?