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B&W created them for situations where it is not physically possible to use a sub properly. You can get information also at their website www.bwspeakers.com I prefer a separate sub, but depends on your budget and taste. The Hsu VTF-2 power subwoofer sells new for $500 direct from the manufacturer. Probably one of the best powered subs for $500 or less new. Still leaves you $1500 to get good main speakers.
placing speakers w/built-in subs can be problematic - the best location for imaging/soundstaging can often be at odds w/the best location for bass response. this is why many top-line speakers are 2 units/channel. i recall reading a couple reviews of genesis' megabucks speaker w/built-in sub - i tink it is their 3rd-from-the-top model, the 1st w/o separate sub towers. seemed to have excellent sound *if* the location/bass-integration thing could be sorted-out, which seemed to be a real challenge...
if ewe want true low-frequency response in a full-range speaker, & don't wanna blow your budget, i'd suggest a pair of used thiel 3.5's. w/their factory active equalization, these offer true 20hz extension, as well as doing that imaging/soundstaging thing that thiel does so well. even in absolutely mint condition, ewe should be able to find a pair for ~$1k. use the savings for amplification upgrade - thiels *crave* hi-quality current, & lots of it! ;~)
Artemus, don't think the Step will fill yr. room. I second Doug's suggestion (Thiels). In my experience, they need very careful positioning, otherwise U get too MUCH bass -- but yr room looks fine on screen for them. Also, Thiels are power guzzlers, as Doug says.
The Genesis V or 500, with a servo controlled, built-in sub, are usually expensive used (BUT, U never know...). It takes time to fine-tune them, but the rewards are very good IMHO, especially in as long a space as yours. I have them and am very happy with them. They too, like amp power.
Any way U can audition some products? To get a feel of how much better (or worse) the sound gets vs. yr present gear...