Now that I have finalized the design (almost anyway) and got into the garage to start working, figure I'd post the details up here for kicks.
B.O.T. stands for Bucket Omni-directional Three-way. It uses a 5 gallon bucket for the bass bin, and seeks to radiate almost equally in all directions. The drivers I've chosen so far:
- Woofer: Usher 8945A. I picked these up for a steal used, and have yet to try them in anything. From what I've heard of the Usher line though, I have high expectations. This driver uses the bucket for the bass bin, making it a vented 19L enclosure tuned to about 40hz.
- Midrange: Vifa TC6FC02. Tiny neo driver, I measured these a while back and they are very low distortion. They sound quite nice too. There are two per speaker in this design, bipolar arrangement. While I've not down the xo work yet I imagine they'll be covering 800 to 5k.
- Tweeter: This is the big question. It faces upward in the design, so excellent off-axis is a must. I am making a plate to be changed out, and I plan on first trying the SB19ST again. I wasn't sold on its sound in the Iron Driver challenge, but I'll give it another shot. Another possibility is the SB26STCN, which has stunning off-axis for a 26mm dome.
These are all smooth drivers, and because they will be acoustically centered/time aligned I expect a very minimal crossover network. Here is the concept: