Greets!

60" H x 30" W x 24" D o.d. or ~ 20 ft^3 net and currently tuned to around 16 Hz, so require some corner loading. Note that my 515's specs are somewhat different from those published, ideally requiring somewhat larger cabs and that internally it's not just a simple reflex, but a single fold Voigt pipe horn with restricted vent [AKA ML-Voigt], so has a bit more usable gain BW and better damped than a reflex.

If the 416As are original spec and fairly closely matched, then would work OK in a corner, especially if tuned to Fs with a high output impedance, or up around 32 Hz otherwise. If they should be more like Pano-Mike's recent re-cones, then it would only be good for one driver.

Regardless, I never bothered to save any design details, so can?t easily provide dimensions plus ideally it would need to be designed for your driver?s specs, then manually fine tuned. Their construction has held up so well over the decades of moving and temperature/humidity abuse that I can?t even find the filled screw holes down the sides to measure from. Wish I could say the same for more recent builds using EPA approved fillers. I can?t even easily discern where I chain sawed a section out of them to fit a previous location.

GM