I can testify to this as Shady stated dualies just have huge output and power for the size and footprint and I'd rather get multiples of those which would be out of this world I love my bass and a lot of it
Here's a pic of my RBH SV1212PR
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And a pic of my SVS dual PB 4000's up front
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I can say this I wish I would have gone the RBH or other dualies route a long time ago.
That RBH just trashes the 2 4000's not even close
It'll trash a single SVS PB 16 ultra not sure if it can best 2 of those tho
But I plan on buying 3 more of the RBH soon
4 of those in that room would be beyond stupid and that's right up my alley
Plus they look awesome and don't take up as much of the floor space as the 4000's do