Finally got around to getting two more subwoofers for my pins.
These are the Polk PSW10. Amazon's prices have varied over the weeks. The first, black PSW10 cost me $90. When I went back to buy more they were $120, and the cherry PSW10 were now $99, so I purchased two of the cherry. Today, they've changed again ($99 for the black, $120 for the cherry).
Anyhoo, these are excellent subs. They have TWO inputs (Left/Right) so I can put two pins on one PSW10. Can't do that with my Sony sub. Dollar for dollar a better deal.
I also threw in photos of a compare I did with the Sony and Polk subs...