Ok. I need some help/ideas please.
After some great advice in the subwoofer forum, I am planning on running a pair of these
Dayton Audio LS10-44 10" Low Profile Subwoofer Dual 4 Ohm
And using this
https://www.skaraudio.com/products/lp-550-1dv2
To power them.
Ok here's where some more help...