I went to the Montreal HIFI last weekend.  A first time for me and a unique opportunity to see and hear some interesting equipment for someone who lives in Vermont (and have some nice food and wine- man does not live by sound alone). One of the most interesting speakers I heard, especially from a Zen perspective, were the Voxative Ampeggio (http://www.voxativ.com/eng/).  I guess these a horn speakers using a proprietary driver.   These speakers sounded great and had incredible bass. I'm curious if a FRX speaker could be used in a DIY version of this kind of speaker.  Thoughts/opinions anyone?

Well, the speaker system goes for around ~$19K but I don't how much just the driver itself costs.  You pose a very interesting question though.

How many goats died making these drivers? Wait until PETA hears about this!