Originally Posted by Squeak
I'm sure you are right. So that leaves the question about the Pensil vs. TQWT.
What are the advantages and drawbacks of each method?
Or what is the general difference in sound signature?
There doesn't seem to a good optimized TQWT design for the CHX-70 drivers though. All of them seem to be generalizations like the Needles and the FH Mk. III if we can count that one.
Well if you accept the definition of a Voigt pipe as a TQWT(P) design, then Woden Beltane would likely qualify. I've certainly yet to hear any of Scott's recent designs that weren't well optimized for the target drivers - indeed he generally takes exception to builders randomly trying drivers other than the intended.
I haven't built a pair of these yet, but unless there's a good reason not to, I'd be inclined to mount the driver on the slanted face ( a la Cain & Cain Abbey)