12-16 10" woofers ? Of what dimensions is the hall of your castle ?
Btw. even a pancake needs some volume in the back, for closed it should give Qtb around 0,5 for EQ up to 0,7 without EQ for flat response.
Going down with enclosure's volume to far will increase power need and potential harm to the coil, but with 16 woofers there might be low enough power consumption for each single one, ... perhaps.
I have a large basement (9 x 11 meters). I have my office, musical instruments, my electronics hobby stuff, and my main listening system. In USA we call this 'man-cave'.
Some years ago, I had four Seas X26x001, and six Seas L26 woofers from previous projects. I built them into 10 sealed enclosures, in very small sealed enclosures. I drove them with a Niles 12-channel amp. They were ugly, and wires all over the place, but I did get great bass,
and learned lots about my room and room-modes in general. The amps and woofers had so much headroom, I could EQ with no worries relative to the sensitivity of my main speakers at the time... I never ran out of amplification, and the drivers barely moved even on unrealistic bass tracks. And it was a mix of the W26 Excel, two generations of L26ROY, and a pair of Rev1 L26RO4Y.
I didn't have sophisticated bass management back then, just level controls on the amp and marginally accurate measurements. I would like to retry this with a more modern approach.
But my mains now are
JBL M2 clones: I would likely need to get lots of these drivers. But I need to finish the M2 cabinetry first!
People are right to point out the things like the asymmetric BL, it is really significant in the measurements!
OP bought
gold-standard subs I think. Which is not a bad approach. Avoid any doubt, and prioritize the work to build the sub's cabinet. And use the headroom that will be available to EQ to flat.
