CHR70, CHP70, EL70, Alpair 7 or FE126En
I've a pair of 166es-r's an would be interested in following that build. Also curious to know what you don't like about the 166es-r fostex recommended box or did you install them in a fostex bk16?Could this be scaled for a 166esr? I've been dying to replace my Fostex boxes and this looks a little easier to build then the Austin A166.
With a 3" driver you may well have to use a pair per box. Maybe i should try the quad of FF85 i have in FH3 before i install the new set of drivers into the Twin uFonken.
One thing i do know, neither BOFU or FE166eSR will work. One critical parameter kills the idea. Driver diameter > box width
This is more of a serious build for a desk top dont you think
How about a smaller FH3 to accommodate a single FE83 in each cab for desktop use. I've been considering the Busch Mk1 as a starting point, but the simpler FH3 looks to be a better option.
What needs to change for the FE83 ?
Everything. A complete new design, from scratch. You can't just shrink or expand this one; the dimensions are critical.
Desktop back-horns in general isn't an ideal way of going about things; esp. not with rear-firing termini. You won't get many benefits & will likely run into a few phase / integration problems.