I believe that One stick and one sub produce a perfectly balanced sound for most applications. In some music ( mostly more modern stuff ) the beass requirements are heavier. I've had 2 subs in the past and found the second one to be of little use for 90% of my work. If you do a lot of Hip Hop or otherwise bass-intense songs, you may want the extra ooomph.
The biggest problem in making the switch to a Bose system is adjusting your thinking. We've been programmed to beieve that a boomy, overdone bass with peircing, brittle highs are the norm. That's what many conventional systems have given us over the years. I, for one, am grateful that there is now a better option for acurate sound reproduction that fills a room, and breaks down to a very portable, manageable unit.
It's not for everyone, but most of the musicians I know have some serious hearing losses. I don't.....nor will I have! I have always protected my hearing above all other things, and I intend to do so forever. The Bose system covers any room, (inside or out) that I have ever done, and it does it with a smooth, acurate sound that travels to the back tables without hurting the ears of the front tables !

I'm Sooooooo spoiled.