One woofer or a pair?

Using a single sub is more likely to excite specific room nodes. Using two subs spread out will allow more even response in the room since you are able to tune the positioning. Try moving a mono sub a few feet in either direction and listen to the difference, unless you have a room with extremely well distributed nodes, you should hear a pretty sizeable difference.

Kevin
The Sound Broker

Can I be clueless, Clueless? I believe I can be... and I also can be curious too especially if I hadn't tried any of the woofer-speaker combos. In fact you might be right about no-sub effect and I would also wait for that answer that you expect. What about the vinyl records that are stereo but designed for the mono pickup as well?? ...

I also believe that giving a sub his freequency range you can improve your speaker's midrange(again depending on a sub quality). Now that's not a kid-stereo stuff.

Off the topic(poetry)
I've placed a few more psych poems onto my thread a long time ago. There were a few abstract dreams but I didn't capture them to write them down -- hard to be in control while you sleep. Besides I don't smoke &%$^ anymore and a probability of the quality abstract dream is much lower.
Before I smoked constantly and saw the dreams that I couldn't understand, but after a while I've realized that I can get up and be under my control to remember what was going on... The 2 worlds that I was trying to live before cannot be successfully combined: one of them will have a success and the other will have a failure...

...evry house has windows up
from every door you can walk a step
but if your way is imprinted with chalk
where would you go if the snow will fall?

In my experience, the only way to get away with a mono sub is if the crossover point is exceedingly low, meaning less than 40Hz. Anything above that and you will be able to localize it. I also agree about the virtues of downloading; it seems to couple to the room better, but again will only work well with very low crossover points.

I agree with Kevin. During the x-mas season my REVEL Sub15 had to go from the right side to the left of the room (because its space was needed for the tree :-) ). Just this move changed my systems sound in a frightening way and I was happy when the season was over - at least in this respect.
It seems to me that it is a matter of your room how you think and act about subs in general.
Good luck!

From all above posts I think that if you're using a pair of woofers you can use them as a "sub-speaker" and give it to work with higher freequencies than 50Hz maybe even upto 200Hz.