Progress is being made. I'm actually mostly done at this point.
For anyone curious about how to get a straight line on sonotube.
Clamps, clamps, clamps...
T-nuts for mounting the driver.
Port glued and stapled into place.
There are a few things left to do. First thing, back to the stuffing. I really don't want to add a lot, just enough to keep down resonances. I went to Hobby Lobby to look for polyester batting, but the thickest they have is 1/4". Then I thought I'd check out the recycled cotton wall insulation, planning to cut the 3-1/2" thickness in half. One bag wasn't quite going to do the job, so it would have ended up costing something like $100. No thanks. Maybe I'm being a bit paranoid, but I'm not too sure I like the idea of using the fiberglass stuff.
So... back to the pillow idea. Do you think if I stapled pillows to the MDF top plate they'd stay? I can't really add anything structurally to hold the pillows up there now. Assuming this would work, how many would you recommend? I know it's a big enclosure, but I want to affect tuning and efficiency as little as possible. Thoughts?
Second, I still need to get binding posts. I was thinking something like this, but I think the "knurled shaft" may be too long for the thickness of the sonotube. I'd mount them in the bottom plate, but then they're not long enough.
These look like they'd work, but I'd prefer the nickel finish.