[Good question - do you have something in mind?
The Scan Illuminator seems to be popular with a some makers using the Raal ribbons. Others are using the Audiotechnology woofers but these seem very pricy.
John Krutke Zaphaudio.com has compared the Illuminator with the Revelator and seems to prefer the Revelator. The Illuminator does have a great frequency repsonse curve though and the measured Qts of 0.55 it may be great for an open baffle design. Pity about the price though
On the other hand, the Raal designer was very impressed with the designs using the Illuminator, stating that previously he found the Revelator dull and lifeless...
Regards
Jose
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The Illuminator could be a great choice for open baffle depending on how it's implemented. The motor gives it the edge in terms of displacement so with the right tweeter and crossover point it can be a great performer. The Revelator is more flexible in terms of tweeter choice but with the RAAL ribbons I think either one could work very well.