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Complex interiors are usually heavier. And more complicated to build. And more expensive from a materials standpoint. So it’s possible but expensive. You tend to see it used in ultra high end speakers where the extra cost can be recouped.
Most of that is just rationalizations. The only loudspeaker cabinets I ever built were 6 cu. ft. tri-fold transmission lines in 1980, after one year of wood working shop class and using my Dad's table saw, not that hard or expensive. Big and heavy, yes but within the realm of doable. Their "problem" was that they were performance brutes, capable of 114 dB at 17 Hz using a single 8 inch woofer, too much for any room I'd ever afford but sounded great in a 20,000 cu. ft. chapel driven by a 20 wpc receiver. Seems to me that loudspeaker manufacturers just want to redo the same old sealed or ported designs in hollow rectangular boxes.
The B&W Nautilus (the one with the curly bass section) is one of better practical designs I've seen (but not heard).
Three pages and no one has clearly articulated why interior rectangles are a problem, especially if well braced and damped. Of course, we know that every box or not-box design has its pros and cons, but what is it about rectangles that cause bigger problems than other designs?
Seems to me that a spherical or ball like baffle might have the least negative propagating diffractions & an egg shaped inside of a box the least internal "boxy" reflections. There have been a few curved speaker cabinets and a few spherical.
Correct, the sphere is the best enclosure shape, second is the cylinder or tube.
"Best" perhaps in one way (i.e., fewer box reflections), but they're butt ugly and impractical. I recall when SVS sold subs in tubes. They worked well in a dedicated home theater room or if you were single and wished to remain so. Otherwise, they looked ridiculous. Today, SVS only builds subs with rectangular boxes.
There's no problem. Stuffing easily damps midrange box reflections w wavelengths less than a foot. Low freq box dimensions are much smaller than the wavelengths their drivers emit, so there is no resonant modes, just pressure pulses which are handled well by a strong cabinet construction and quality voltage source amplifier. Beware the hifi intelligencia who believe specs and measurements, construction technique and the consensus design formula of the moment are more important than the sound and feeling the speakers make. Im not sure they actually believe in it themselves either, but they sure do want us to believe them.
I agree with a lot of your post, but.....https://www.svsound.com/products/pc-2000-pro
Here's a couple of active 2-way designs that clicks many of my boxes from a few years back....
