(9.1*12*12*12)/(46.5*16.5)=20.5 ok those were external dimensions, (double baffle?)
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lowers tuning by about .5 Hz
I see you want to keep tuning the same through all options
Ok well ill start with the obvious, your smallest box will handle more power, and the larger box limits the total power you can potentially run. Keeping the same port area from the larger box will make the small box/ port more efficient given the smaller internal volume than the larger. The last option, would net about 750 watts more usable power, but only a small db gain mostly on higher notes. The port will eventually be the limiting factor on getting the most spl on the sub 40hz notes. Cone control is good with these subs and they can handle 12k mechanically in all of these options but you won't gain much beyond about 6k total power. But headroom is nice.
Now, you have sweet subs, I had zv2 but never the zv3 for some reason, and I like your setup. I'm just suggesting a simple alternative. Try and switch from one 10" port to multiple ports. Three 6" would give you a bit more usable power, like a kW, but two 8" ports would allow double the usable power compared to your exact current specs. Two 25" long 8" aeros would give you another 3dB of potential gain and more low end, as short as 18" long 8" aeros to give you a 4dB gain over your current response, but with about the same bottom end.
On 12kW you will reach xmax around 26Hz so don't play around way below tuning full tilt no matter what design you want to use. But on 8k ish that dual 8" aero would get loud.
I hope that all makes sense, I was just kind of jotting stuff down as I went. Lmk if you have questions
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