Hello, I currently own a modest (both in number and value) collection of headphones, most of which have low impedance (32 to 60 ohm). The source is an Asus Xonar Essence STX sound card and the OS is Windows 8.1 Pro 64-bit. I like gaming, listening to music and watching movies with headphones. I have no problems with the sound card, it works perfectly, other than its output impedance (10.31 ohm) is not ideal for most of my headphones. I tried connecting my Fiio E12 Mont Blanc portable headphone amp (which has an output impedance lower than 1 ohm) to the Essence STX via the two RCA jacks that the STX has. It seemed to work OK (music listened in direct HIFI mode sounded good), but as soon as I activated any of the DSP modes (games, movies or music) of Xonar Audio Center, got a lot of undesired reverberation. So that is not a solution. I have been having a look at the current sound cards for PC. The new sound blaster AE-7 or the more expensive AE-9 (both with an output impedance of just 1 ohm) might be a good replacement for the Essence STX. But they are so recent and Creative software support seems to not be the most reliable... I'm not sure of going that route. What other options do I have, if any? Thanks.