While I agree the arrows make noise....I think we lend too much credence to this. The reason I say that is......we hear the arrow from a completely different view/audio point than the deer. I've set my cam on my target (when I was shooting Montecs) to see if I could hear anything, from the deer's perspective.

A loud bow is most times cure-able. Important. Granted. But as far as the arrow goes....I think the first sound a deer's gonna hear is his gurgling lungs and the blood spurting out the entrance/exit.