Quote Originally Posted by GM View Post
A narrower cab will have a higher baffle step, so the XO may not work all that well unless some outboard frequency response shaping EQ is done.

No, and frankly not worth the effort since for far less time/$$$ expended you can tweak the 811s to a fare-thee-well.

GM
Not sure what you mean by a higher baffle step. Couldn't the narrower cabinet's port be tuned for a 416 the same as for a mod19?
A friend offered to make a 811 mold for me, but I haven't given him my 811s from my mod19 to use as a model. (and won't) Although, I have been trying to buy some 811s but everytime they come up on graigslist, I've been too late.
The thought of a narrower and taller cabinet, is that I like the sound stage elevated and I was thinking that the 811s might sound even better from an elevated position. (I guess I could set my 19s on 1 foot blocks and see if there is an improvement!)
The other reason was a smaller footprint and maybe less cost.