.....Caseworker, you're good, you turd....you had me going on that top part, honestly....I was thinking, "well, here's what seems like a nice guy who just doesn't know those three mini-barns are subwoofers that can snuff a bic at 5 feet"....but then you advised me to go find a subwoofer at Wal-Mart, something silver and shiny, and my head locked up....seriously, you got me

.....
.....on the bottom part, no, I've never measured anything concerning them, and I only have the middle one hooked up....three would surely fill an arena, and it might just take two....they measure 136db at max 2500 watts....a strapped K2 sends 2500 2 ohm bullets, but I don't strap amp channels, period, and that's only what I hear from "my" system.....
.....I've been told some casinos in Vegas are using this sub for their music shows....if they've got one cranking, the oscillations could probably be felt about anywhere in the building....I love the presence they present....the four 12 inch subwoofers, with two on each side, the outer one in a vented inside chamber reinforced by a second one right behind it, with one side of the cabinet wired in parallel against the other side wired in series for a 4 ohm overall, are then ultimately cross-wired so both sides of the cabinet are out of phase with each other, and all move the same direction left and right across the cabinet.....
.....that handsaw action thrusts wonderful oscillations out the front door that present soft but strong qualities....what you hear and feel is a soft and breathy paaaaaaaahhh with distinctly detailed oscillations that are bold, defined, resolved very well, and "clean"....hope all that made sense....I also like the fact they're front-firing....that's my favorite, where I'm in the direct cone of dispersion, with no significant bounces yet....I want to "feel" the bass guitar coming from the front soundstage, not hear the air being fried in the whole room....just a preference....thanks for the response, Caseworker.....
http://www.hometheaterhifi.com/volume_10_3/svs-b4-subwoofer-9-2003.html