Wow, two weeks went by just like that!
My plans changed when we realized that we weren't going to have enough room, nor any real need, for a sound system. So I didn't finish the AutoTubas and take them to the event. The event (Youtopia in San Diego) was really fun and crazy. And we were camped near enough to a massive sound trailer that I went to sleep each night with bass shaking my tent quite thoroughly.
But now I'm back, and I'm going finish the AutoTubas since I ended up putting the THTLP I built in my living room rather than the garage as I originally intended. I can use the AutoTubas in my garage! And it would be nice to have have some subs that I could fit in my car and take to an event just in case I need to throw a dance party somewhere. It could happen!
I glued up panel 7 on both, which went fairly smoothly. I like to use brads to tack the edge in place, tack a scrap across the top to keep the panels square, and then squeeze the long edge together gently with the angle iron and light clamp pressure.
And I glued up panel 8, too, using a similar technique: brads to keep the bottom in place, temporarily squeeze the panel down with light clamp pressure, and then put brads in the other edge. With the brads all in place, I then clamped a square brace on the corner, and used some scraps and more clamps to gently squeeze the rest of the edges together:
Total time spent so far: 17h29m, and enjoying every bit of it. I can't wait to fire these guys up and see what the little 8" drivers can do.
I am using my Behringer A500 amp for my THTLP in the living room. I need another amp. My THTLP uses an MFW-15 driver, which I think could use up to 300 watts, where the A500 can only make ~240w @4ohms or ~130w at 8ohms. So I might power the AutoTubas with the A500 and get a new amp for the THTLP. The MFW-15 is a 4-ohm driver, but I think the horn makes the impedance higher, or something like that, so it is only getting somewhere between 130w and 240w. What amp can do about 300w @8ohm and is efficient so it can run off my little gas generator? I'd like to get a stereo full-range amp, rather than a mono sub plate amp, for flexibility.