2 REL Storms or 1 Stadium?

Is the bass from the Storm (which version?)not integrated well enough in the room? The single Stadium III in my room has ample bass. The orientation and final placement is according to the setup instructions on the Sumiko site. I use the high level connection from the amp also. You might want to take a few minutes to follow those instructions, if you haven't already, before buying another sub or replacing the one you have. You really do need to move the sub in small increments during this process and it doesn't take long to first get it placed properly in the room.
I have read about good results using two Strata subs, but don't recall about doubling the Storm.
REL setup

Having owned everything from Strata III to Stentor III, I would say unequivocally that the Stadium III will blow away two Storm III's. It's not a matter of quantity but of quality. To be honest, the Storm III was my least favorite of all the RELs due to its obvious bass reflex loading and the terminal muddiness that comes with it. The Stadium III is a major step up in fundamental sound quality, something you will not get by adding another Storm III. Of course, be prepared to spend more time in placement setup since it is harder to get one sub to load the room smoothly than two.

I went today and listened to the Stentor. It blew me away! I guess I just have to save a little harder to get one of these monsters. Any comments on how the Stadium sounds compared to the Stentor? Is it worth the extra 2 g's?

I thought a lot about getting the Stadium when I was looking for a sub - I went to my dealer and demo'd the Stentor and new the stadium could never give me what I was looking for compared to the stentor. Yes, the price is high but, is it worth 2 g's more - absolutely!!!! Once you take the financial hit you will be happy you went the distance. If I had bought the stadium I would have always wondered if I should have bought the stentor - now I sit back and enjoy the phenomenal sound this work of art provides my system. Do what you need to do to pony up the extra cash - you will not be sorry you did!