xonar u7 mkii

Hi, I recently Bought a Xonar U7 MKII Usb sound card, a audio technica ath-m50x and mod mic 5 But the sound isn't loud enough, its about the same as the on-board audio volume. which is about 50-60% of what i need. I use to run a Xonar Phoebus internal sound card, but unfortunately it made alot...