Thanks for the input guys. I went out yesterday to my local Tweeter center and listened to both the Depth and Grotto. I was impressed with the Depth, but Tweeter only had two left in their entire network. The floor model I listened to and another one at a different store that was already sold. The Grotto was good for music, but it lacked the weight I am use to for movies. I currently have the Paradigm PW-2100, which could not keep up with my ML speakers for music, but did very will with moves. This sub's amp got fried during a thunderstorm so this is why I am looking. I really liked the depth, but Tweeter will not lower the 1,098.00 price even for the floor model that looks like it has on the floor for five years (lots of niches and scuffs).
I also managed to listen to a sub from Monitor Audio at a local HT Shop. I was really impressed with the R720. It had the music qualities of the Grotto, but had much more weight for movies. I also liked the price, 800.00 for dual down firing 8 inch woofers. Of course not as much weight as the Depth, but for the price and performance it seems to be a better buy than the Grotto. The only problem is that I could not hear this sub with ML gear. Has anyone used this sub with ML speakers?