I'd like to self indulgently report on a new speaker build.
I set out, in August, to start a pair of DTQWT (double tapered quarter wave tuned pipe) transmission line type speakers, which a forum member turned me onto. These are a design of Troels Gravesen, who has been likened to the "Nelson Pass" of speaker design. Many reviews confirmed that Troels is a talented speaker designer, and many examples of his various speakers have been successfully built and nary a complaint about any of them.
I took exceptional care to execute the built according to the specified dimensions. (It's amazing how many people take liberties that surely amount to significant but random design changes!).
I'm sure the time invested is over 200 hours, and far more than planned for, but the total cost was a mere $2846 Canadian dollars.
This is essentially a 2 way speaker with an integrated sub woofer. As sub woofers go, it's not very "sub." The speakers play down to 40Hz, with a bass that the Who might characterize as "meaty, beaty, big and bouncy."
Now for some pictures. . . .