Just something I discovered today, after having some trouble with crackling on my STX II 7.1. Apparently sometimes "bigger is not better", because my card fails the 96khz intramodulation distortion test in a serious way! At 96khz I can hear all sorts of unwanted artifacts. Keeping it to 48khz...

I have a pair of Beyer DT990 600 ohms, I love love LOVE them.  However I wanted headphones for work, and I decided to go for a closed back to keep sound leakage to a minimum.    I bought DT770 80 ohm, thinking it would feel and sound somewhat similar. For some reason I just cant like them too...