Archagon, initially I did hear a significant hiss on wireless. I then tried wired and was shocked to find the hiss still there and the sound was terrible. I changed cables and it went away. Then after 40 hours of burn in the wireless hiss stopped as well.
Not sure if that will help you but good ouck.
After more listening on wireless there is no comparison to the wired sound. In fact the wireless mode isn't that great compared to other wireless headphones.
Theroretically AAC up to 264kbps should sound as good or better on a wireless headphone as unamped wired if done properly so that’s disappointing to hear. Is that on the newest model?