@holmz The FA251. At this point I have a single driver design using the LB8 MKII here. I plan on an active crossover using this. I made one recently for my main system and really like it.
I do intend to do a mockup of the single driver enclosure first. If I don't like it, I'm thinking can add a tweeter/super tweeter to the design.
One step at a time.
I built a subwoofer last spring using the FA251. I liked the amp so much I bought another amp and replaced the amp in my B&W 610 subwoofer.
This new build is for the living room/kitchen area. Probably not more than 75 - 80db most of the time.