Pulled one of the 10-1/2 lb woofers tonight to peek under its skirt.
Fairly standard bits- cast frame, though it completely surrounds the
magnet. It does indeed look like it needs surround sealer- badly.
The surround is bright because of the light on the front side. It also
looks like sealer was used in the center of the cone and that it's
cracking/peeling a little. Won't hurt to reapply here, too, I guess.
I'm not sure if I mentioned some early production cues- the screw
holes vary some, and some of the screws are in at an angle- T-nuts
and all. I think the box was laid on its back, holes were drilled, nuts
installed and the speaker screwed down. The other box mount is
precise.