Thanks to Darren Thomas who helped me build the cabinet just in time for Christmas, I am enjoying the 1801s with a 4.0 cubic foot sealed SCC300/Hypex HS200 sub. The integration is very good. I'm still playing with the multiple options on the plate amp.
Since I do not have a HT receiver with bass management, I'm plugging my pre-amp outputs to the Satellite inputs on the Hypex and outputs to my AKSA amps. So, the active crossover on the Hypex is doing high-pass to the 1801s and low-pass to the SCC300.
I have a large family room, about 17'Wx22'Dx 8'H. The sub produces plenty of bass for my taste. But just in case, I bought Jackman's SCC300. When I can afford to buy another Hypex HS200, I will have stereo subs... perhaps in smaller cabinets.
I'm glad that this Forum is open again.
Al