Couldn't ask for more.

This is a great card I currently run it with my Beyerdynamic DT 990s and they sound great together. My card before this was a DX and there was a pretty good jump in audio quality even when not using the AMP. I knew this card would sound great with headphones because of the onboard amp but what I wasn't expecting was the added kick with my speaker, I plugged them in and while the bass has always been good with my DX as soon as I changed to the ST it had so much more power. My only real complaint is that it is PCI, yes I know there is the STX with PCIe but the sound from the ST is a bit better. A great card especially if you can find it used for $130.