Design Acoustics' D-12 was always one of my favorite designs. A dodecahedron speaker (in theory, it was supposed to mimic a pulsating sphere) from the early seventies. It had a 10" downward firing woofer, a 5" upward firing midrange, and nine tweeters on all but one of the remaining faces (which contained the woofer port).
I have not been able to locate a photo of one yet, but do a Google search for dodecahedron speaker. There are other companies using this design.