I've been thinking about SDA lately and was recalling the marathon thread that was started by Paul a while ago.
One of the concerns is the width of the speaker. Is it necessary for the drivers to be completely side by side? What if you offset and staggered them slightly? I was thinking about the LSi9's and how the tweeter is offset. Would that be doable?
If you were to use the 5.25 drivers and offset and staggered the SDA drivers, it wouldn't have to be THAT wide.
Just something that I was thinking about.