The sub III is a powered sub that Warwick produced a few years ago, to use as a complement to either a combo (standing up, it has the same footprint as a CL...) or a full rig (lying on the side it has the same footprint as a 4x10 cab...)
And stroud, I'm also interested in the beast, but have to clue why there would not be a volume knob on the thing... :?