This unit is able to operate the Sennheiser HD650. Driving well and the base is reproduced quite ok.
For this price it is cruel!
Bought this for the computer to run my Creative Aurvana Live! 2nd The difference is huge, especially in the control of the base.
It is also seen that there is good in force in the step compared to my SB X-Fi Titanium HD.
Titanium card is actually really good with interchangeable OP-amps and shielded from the rest of the electronic hum of the computer.
Head Box S lifts the sound another couple of snap. For your money you get a lot.