Actually many people use AE for Airport Express so that's not a problem.
The poster said AE, but then specifically said Airport Extreme in his posts which is why it's not making any sense to me what he's actually talking about.
Sorry I'm a numpty I ment Express I was tryng to get information on weather there would be a sound upgrade from using Apple Tv if the output would be better quality going through the HDMI cable as opposed to the optical cable that i'm using now.