Chris , alas, it's still a lonely single unit ( like me unfortunately ! )
Work shifted to the F4 and and the first bass/mid horn .
Most pictures I took were shown on this thread, page 5 and 6 :
http://www.diyaudio.com/forums/subwoofe ... orn-5.html
It's sealed-up now, apart from the removable base panel .
I tried it fed from the F4 on Sunday and it was pretty good, but I still think I need to hear it in the context of a third-order low pass and the bass/mid speaker to appreciate properly . It's got plenty of Oomph for sure.
"Once you find out ... the Circumstances ; then you can go out"