Here's a little project I've been working on here and there for awhile. It uses 2x MCM 55-2421 High Excursion 8" Woofers in a sort of front-loaded bandpass horn/ rear-loaded reflex ported cabinet. The design was a bit of a stab in the dark at the time it was built. I wasn't quite sure how the two high-excursion drivers would react in the 90 degree front-loading. The reflex of the rear-loading should have been fine as it was modeled with winISD for a tuning of 30hz with a delay of 14 ms (the port is pretty long). The cabinetry and finish ended up being really nice and it now exists in my car as a 2Ohm cabinet with a Kicker amp. There is an in-lay of plywood edge-grain wrapping the cabinet for looks. It is definitely powerful with cabin gain around 30-40hz, but also noticably drops off in the upper bass around 100hz. This is what the modeling in winISD had depicted as well. The bass is rich, but also a bit slow due to the long port length. I enjoy it overall and the drivers sure don't cost much.
Did you actually measure Fb? Using slot ports like those, changes the port correction factor and drops tuning significantly from what calculations tell you for a normal port that is far from cabinet walls, let alone utilizing the walls.
This. Run an impedance curve on the box to see what the Fb actually is.
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