One follow up question... one thing that is bugging me as I spend more time with this is the huge variations in volume from one seat to the next, even in my very modest-sized room (12x20x9). I'm sure this is no surprise to those who have gone through this saga on their own.
I understand that the common way to even out the response around the room is to go to dual subs, which I'm totally open to (especially since I now have two), but the input impedance (I believe that is what it's been called) on the EP-600 seems to makes this incredibly difficult.
As soon as a second sub is plugged into the chain with the EP-600, volume drops through the floor on the 600. Not to leap over all of my questions above, but does anyone have suggestions for overcoming this problem without sending the 600 back and going for another sub that is more flexible in a dual sub setup? (buying 2 EP-600s is not an option).
Thanks again.
