How about photoshopping an M160? Double the drivers of an M80, but put them side by side. So you'd have a square array of tweeters over a sqare array of mids over a square array of woofers.

Although it might sound and look better to offset the columns a bit, like so:

t--
--t
t--
--t
m--
--m
m--
--m
w--
--w
w--
--w