Thanks for the advice guys! It now works perfectly. I'm a little bit new to this (using a cx 880 previously), first time i've encountered the extension cord actually affecting the balance of the sound.

Just got the packaged from amazon and was pretty excited about it, unfortunately I think I got a defective one, the right ear has a severely low volume compared to the left ear. Don't know if that's the way it should be or I just got a defective one.