Sean, as you know, you can only calculate a reasonable starting point and work from there. Unless you have a pre-designed cabinet plan that is known to work for those drivers. One plan that could work with them would be the "Ace" cabinet. This is a "double Voigt Pipe" folded design, that was originally made for Lowthers. It had an up-firing Lowther with a 360 degree reflector mounted above it. If you made this design with a Walsh driver, it would not need the reflector, and would still have the omni pattern. The cool thing about the "Ace" cabinet, is that it has 2 different Voigt Pipe tunings inside it, that are tuned to coincide with each other at the "comb filter" frequencies, and do a good job of eliminating these dips and peaks at the F2, F3, F4 and so on. The cabinet is a folded design and is not real big, and is designed for the driver to be mounted on top. Bottom end is about 40Hz with a vented roll-off. Anther interesting thing about the Voigt Pipe design, is that it is not sensitive to individual driver parameters, but works as a combination of back-horn, t-line, and reflex, and seems to work with many different drivers, even different sized(like 4") drivers, with excellent results.It sounds like a perfect plan to me, for the Walsh. It is available from the Lowther America website, under "Cabinet Plans". Worth a look.
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