Quote Originally Posted by mah View Post
In the pic, above, could the 7/8ths inch exit hole have been produced by inserting a 1/16th inch thick sleeve into a normal 1 inch exit hole?
If so, could the sleeve be readily removed?
I only have a guess here, but the 900 series drivers have a much shorter throat, so perhaps when mated to an earlier horn, the reduced diameter makes a better match. Just a thought.
I don't think you would want to remove the sleeve.

As far as lower crossover freq and over excursion, I would not think this to be an issue in domestic applications using low power. I can blow my ears out with 10w total to a pair of A7's in my living room, I never cared for the 500hz crossover anyway.

Ron