This is a suggestion from thylantar who's been helping me:
"Why not build some Pi Speaker horns? Wayne will give
you the plans. He offers different designs, horn and not.

http://audioroundtable.com/PiSpeakers/

Just ask. I don't remember which product line is the big horn."

So I posted here... can you guys tell me a little about your Pi speaker horns???? and what's the difference between that and a unity horn