For those that have not heard Lou's speakers with the AP option, you should. The bass modules, of which I already have my order in, will enhance the system, in my case Ulysses, by lowering distortion, which is low to begin with, and enhancing the speakers ability to move air, just like real instruments.
In my opinion, the Ulysses speakers are already the best loudspeaker I've heard at any price and figure to get even better.