Dolby Headphone supposed to sound like this?

[AeoNGriM]

I've been using a Xonar D2X PCI-e for about year and a half. I recently bought a new set of headphones, Sennheiser PC360's to replace a set of Speedlink Medusa NX 5.1's. I'm very happy with the sound quality on the 360's, however I'm having an awful time setting up the Xonar CP to work with Dolby Headphone. When set the Xonar CP to Dolby Headphone, everything sounds tinny and echoey, music, movies and games all have this effect. This happens no matter how many channels I select, or how many settings I fiddle with. I'm on 2 Channel Headphones, with 192Khz selected. I'm getting the same tinny, echoey effect when I use the DS3D GX Hi-Fi, Music and Games presets and none of the Equaliser Presets seem to work either ie Jazz, Rock. I end up having to knock Dolby Headphone off and am then stuck with basic 2 channel audio in gaming, which sounds rather poor, directionally speaking

What the hell am I doing wrong? Can someone run me through the exact settings I should be using to setup my Xonar to use Dolby Headphone properly, or to at least get the most out of my gear.

(I was getting the same echoey, tinny effect on the Medusa's with Dolby Headphone enabled so I'm sure the issue is with the Xonar and not with anything else. Tried re-installing the drivers after running DriverSweeper, tried reinstalling the OS to no avail. Maybe the card is borked, but this is really driving me nuts!!)

 

[AeoNGriM]

Thanks for the replies regarding my problems. I'm seriously ****ed off. I went from a 30 quid pair of USB Microsoft Lifechat LX3000's, which I had no sound issues with whatsoever, and spent over 250 on top of the range sound equipment and the result is a choice between tinny and echoey sounds, or basic 2 channel stereo. What's worse is the PC360's are open backed, so the sound goes right through my mic and onto Teamspeak, driving everyone nuts. Don't know why I bothered.