To my eye, it looks like the speaker placement goes like this:
[-----------------------]
l tweet tweet l
l 10" 10" l
l l
l 12" 12" l
l l
l 10" 15" l
l l
l 15" 10" l
l------------------------l
[ port ]
_____________________
I could be wrong, but that looks really friggin cool. Imagine a wall of those a la Gene Simmons style.
i think its
10 12
10 12
10 15
15 10
