It seems to me to be a question of "if your serious" about low end performance. If you are, then get the power, and build the numbers... since 4 is awesome', 6 is 'serious', and 8 is "devastating"! When I first built a (l) LABsub, I laid it down behind the car (outside) and hooked the system to it. It is a "competition" system meant to be run @ SUPER LOW impedance...for LF reproduction power...even @ the LABsub's impedance for one cab it was clearly "thumping" 2 blocks away and could be "felt" 4 blocks away... off response".( I soon added a second and it was...well we HAD to have 2 more...and so on. We have used 6 outdoors(mono block), with "canned" music for an outdoor "pro" lazer light show, it was palpable...you could feel the thump that far away. Note: it seems implausible, but that was all done with a single "Digam" 5000 amp... a one rack space 17 lb amp...That was (by the way) outdoor, all day and night, and it was HOT... That amp even ran on a 150' 16 gage extension cord. Granted not to full potential, and not that day, but it also seemed to work no matter what the speaker... but I digress...
The LABsub's in the configuration they were designed for, finally gave me the low end I had been dreaming of. I have a system in my house and car, and I too wanted to match the impact of the home, and car systems. ( the home system incorporates a "Sunfire" truesub, and Infinity RS1's. I think now... my "house(BAR INSTALL)" system, sounds BETTER than both my "everyday" systems.
Proper numbers, sufficient power, good Edison supply... and you will FEEL the difference... ( Oh and DSP processing like the Driverack 260-4800, or other Pro processor) and it's ADDICTING!
Gary
Twilite Zone Productions