Are big subwoofers viable for 2 channel music?

I'm curious if anyone has tried having a multi-way sub array with several small subs throughout the room and one big one that only plays the lowest notes.  If you give a big sub a gradual rolloff starting at 30 or 35 hz it's less likely to have negative interactions with the room in the higher frequencies that tend to have the most problems.  Then add a bunch of smaller, cheaper subs that rolloff above 30 or 35hz.  It'd be a hassle but might get the most bang for the buck.  

I've got a tiny psb subseries 100 that sounds fantastic but has very limited dynamics and extension.  There's a used one on ebay for around $100.  I might be able to buy 10 small subs for not that much money.  Having a whole bunch would even out room response everywhere but the lowest bass.  The limited dynamics would be greatly improved by having a whole bunch of them.

Has anyone heard of or had experience with Snap AV?  They are a custom install only brand that I had never heard of.  I ran across some used subs on ebay for dirt cheap and they appear to be well-designed.  They're sealed, and have phase knobs instead of the 0/180 switch.  I consider that to be a sign of serious design in a sub.

I wonder if the low name recognition results in them having terrible resale value even though they're pretty good.  I just bought one for a whopping $112.  Not much of a risk.

When it comes to big vs little subs and one vs many, I don't care.  I just want the best performance for the money.  I already have a Velodyne dd18, Infinity Intermezzo 1.2, and the tiny PSB.  One thing that I know is that it's impossible to get flat bass in any room I've ever been in with a single sub and without a lot of bass traps and eq.  I tried when I was in my twenties and it's not worth the trouble.  I did get really flat bass with the help of 25+ bass traps and extreme eq.  It sounded weird, though, and I didn't stick with it.  I find the claim that multiple subs can solve a lot of room problems plausible.  The more you have the less hard they all have to work and I'm confident the room nulls can be solved by this.  Since the more you have the lower volume setting they'll all have, the node excitement is bound to be reduced.  The main problem with small subs IMO is that the small driver needs extreme excursion which means extreme pressure in the box and a ton of power.  These things are very bad for longevity.  

I'm not opposed to having 10 18" high sensitivity subs but if I can avoid it I will.  I agree that high sensitivity has a sound characteristic that I like.  

I can confirm that the Snap AV sub is a good quality littlle sub.  It's got good output down to 37hz, pretty much done by 30hz.  For an 8" sub for $112 on ebay it's a steal.  Gloss black box, good controls,  I wonder if all custom install only brands have terrible resale value.