Ok, perhaps I was a little bit hard on the Kappa 15LFA's for two-way duty. I just chose NOT to use it because I found a better alternative... the Kilomax 15 at a sweet deal :) I'm sure the Kappas do sound quite decent with the PSD2002.That said, I still think that the Kappa 15LFA WILL make a decent subwoofer. Not one with the deepest extension in the world, but a sub that will fit in a cabinet that is acceptable size for a livingroom. Like I said earlier... there WILL ALWAYS be a trade-off between efficiency and deep bass when it comes to subs. If high efficiency AND high SPL is the goal, prepare to have absolutely HUGE cabinets. Most people I know can't tolerate anything bigger than 5 cubic feet for a subwoofer unless its in a dedicated home theater room. If I was building a sub for myself to go with high-efficiency mains, I'd go with an Adire Audio Tempest or dual Shivas with a BIG amp.
FWIW, that is just my opinion.
Colin