Asus Xonar DGX "tinny" echo w/ Sennheiser PC 350 Special Edition

[Oxlton]

Yesterday I received my brand new Asus Xonar DGX Sound Card from Amazon. I decided to pair this sound card up with the new headphones that I also just bought, Sennheiser PC 350 Special Edition, due to a huge sale ($80) on Prime Day. Over the weekend, I tried the headphones out with my on-board audio chip and they sounded good, the microphone sounded good, but I felt like I could do more to actually drive these headphones. When my Xonar DGX came in the mail I instantly installed it, installed all the drivers, and connected the headphones to the sound card directly and I was surprised to hear the headphones were very "tinny" and had quite the echo on all sounds. I tried messing around with the Asus Sound Studio settings but nothing got rid of the "tinny" sound. Has anyone had similar problems to this? or does anyone know a solution? Some recommendations that I found over the internet suggest to burn-in the headphones, driver problem, on-board audio problem, or possibly a faulty sound card or pair of cans.

PC Specs:
Mobo: ASUS Z97-PRO(Wi-Fi ac)/USB 3.1 LGA 1150
CPU: Intel Core i7-4790K
GPU: Evga GTX 660
RAM: G.SKILL Ripjaws X Series 16GB (2 x 8GB)
Sound Card: Asus Xonar DGX
SSD: SAMSUNG 850 EVO 2.5" 250GB
HDD: WD Black 1TB

Thanks for your help.

 

[Oxlton]

Just an update for those wanting an answer. I did disable my onboard audio but I was still having problems. I then uninstalled my Xonar DG drivers and software and installed unified drivers from http://maxedtech.com/asus-xonar-unified-drivers/ that fixed all my problems. Audio is great as of now, weird to think that Asus put out unstable drivers and custom made drivers work better than what is intended.