sorry didn't see it right away! Ok, why more than one bass speaker: Quite easy to answer really: When it comes to bass, there are 2 magical truths in a loudspeaker's life:
1. Low frequencies are hard to place in your listening space, which makes it rather irrelevant where you place a subwoofer...put it behind the couch, doesn't matter sounds great anyway.
2. The more bass you want, the bigger the bass speaker needs to be. Bass frequencies are transported by air and they spread around on a linear basis, no matter what obstacles they hit (see 1.) The bigger the bass speaker, the more air is being vibrated, the more bass hits the ear.
Quite simple really! Now why 2 or even 3 bass speakers?
Simple again: If you don't want to build large speakers, like the B&W Nautilus 1, you need to have more than 1 bass speaker to get bass volume (Remember: The larger the speaker, the more bass!!), just build it into the side of the speaker (quite a few manufacturers do this actually), it doesn't matter WHERE they put, a s long as it is there!
What is better, 1 or more bass speaker? Hard to say, from a physical point of view there is really no answer, again you just have to listen to a few speakers using both principles, I definitely like those with one big bass speaker much better, but I do not expect other people to say the same, it's just personal.
As for the Monitor Audio: So you've heard
...well then go find a dealer and LISTEN to it!!!! And don't forget to tell me your opinion, I'm always interested!
Hope that helps!