How many things are wrong with this proposed/crossover design?
Even using Non-Polarized Electrolytic for cost reasons, this would be an expensive circuit.
This would be a six 12" woofer setup in a stacked Ripole/Linkwitz fashion, cone to magnet with an overall height of about 30". Total cone area equals ~ two 21" woofers.
Woofer enclosure was modelled in AJhorn 7.0 for one woofer. Impedance and frequency response were copied to VituixCAD where the crossover circuit was "designed" (<- a term I use very loosely). I was shooting for an LR4 at 75Hz.
These are very cost effective high QTS woofers (QTS=1.3) and efficiency was thrown out the window in favour of frequency response.