Billy,
I'll be sure to post again once I've hooked up the CS2 and tried it out. I wouldn't call the Athena sub crappy, but yes I did have the AS-P400 sub. It was pretty good for it's price. Of course the MFW-15 blows it out of the water and I'm loving it. This thing is huge and I still can't get over how big it is. I had to put a fleece blanket over it so that people don't mistaken it for a end table since it's right next to my couch. The finish on this thing is beautiful, but unfortunately the blanket covers it. It rattles my apartment and I'm surprised my neighbors have not complained yet. Of course I only play it loud during the day and not too late at night. The only complaint I have, which is very minor, is the fact that the grill is attached by magnets and not by pegs. The reason is if I play it loud, the grill sometimes moves a little bit from all the shaking. It doesn't move that much, but I still notice that the grill is not on straight. Other than that this sub goes deep and loud. I still need to do a frequency response test to see what kind of performance I'm getting. Since moving it to a different location is out of the question, I might have to buy a PEQ to flatten the response curve.