I love the Soundblaster AE-9 and AE-7, but to be honest you'll be really happy with the Soundblaster X1 for the DT900 which don't need major power. The 5.1 virtual is just as good, the software for SBX has gotten a lot better in the last few years. Just get a longer cable, or if you have a noisy gaming computer, the optical USB cable like the Fibbr will plug right into it for a quiet noise floor. I've got an AE-9 and have had the DT900 and if it was me, I'd just drop the $50 on the X1 and you'll be really happy. It needs a longer USB A to C cable if you're not on a laptop though.
