It's from the JBL performance series, PC600 center speaker, but it has the exact same midrange driver as the Salon2. A fellow member found this on eBay for me, and this guy bought it a little over a year ago. I can't find one mark on it anywhere or the grill. What a steal for 75% off it's original cost. Thanks to him I lucked out.
In a word, NONE. Different drivers, different design engineers, different intended Markets. Don't let the appearance of some of the drivers fool you. They are not the same. In addition, the design philosophies of the two companies is considerably different. It is mostly accidental when a JBL and Revel sound similar. We are basically going after perfection coming from two different directions.
Some of the in-wall speakers are, in fact the same units with slightly different voicings, but that doesn't apply to the big boys.
I knew it!