Two subwoofers??

I have certainly gleaned alot of good information from the follow-up threads to my original question. After reading all of them, I have come up with the following:

1. Everyone seems to agree (except for Search4tas) that I could certainly benefit from two subs. Let me clarify, that I have auditioned the M20's, and they did have a great bottom end for a mini-monitor.

2.The end result from the use of two subs is heavily dependant on room placement and room dimensions / layout.

Let me put another question out there then. My previous question and all of the resulting threads assumed that I would use two subs with 8" drivers (as I stated that speed was a priority). My question then is this: What about two subs; one with 8" drivers that would be x-over to kick in between 80Hz and 40Hz and a 15" sub with a x-over to take over lower than 40Hz. This would require an external x-over in my setup, but would negate most of the sub placement problems. Anyone tried this????

Thanks for all of the great info so far......

I was not suggesting using three subs. Let me clarify. I have B&W CM2 speakers for the front and surrounds. These are great speakers if only a little light on the bottom end. To fill out the lower end, I now have only the one sub, and am exploring the idea of a second sub. My previous thread was to inquire if anyone had tried a two sub arrangement that used a large driver sub for lower freqs (40Hz and below) and a smaller driver sub for the 80Hz to 40Hz range.