To a large degree, the real culprit may be being ignored. These speakers have neither a good lower extension nor are very tight in the bass. Personally, (having owned the 602 S3) speakers (and other B&Ws), this is somewhat the sound you will get with the speakers (until you get much, much higher in their line-up). You are comparing them to your Klipsch speakers which have a typically deeper/lower bottom end extension - though not very tight and somewhat loose.
It sounds like you have become accustomed to the Klipsch bottom end (while not very accurate, it is more noticeable) and are comparing too very different sounding speakers. I would work on room placement if you are trying to get a bass sound more in-line with the Klipsch (more than anything else). For $250 for a sub you are pretty restricted and may be better off saving a bit. I would avoid the B&W subs (not very good, had one), but think that with these speakers you would be well served by one of the REL Quake subs (starting with the Q106? and going up from there based on available budget).
The REL's are much better subs than most others in this price category (at least in terms of real bass control vs. just boom, they have good speed and decent extension). If you want the sub to boom (more like the Klipsch), this will be controlled based on locating the sub and the general set-up.
It sounds like you have become accustomed to the Klipsch bottom end (while not very accurate, it is more noticeable) and are comparing too very different sounding speakers. I would work on room placement if you are trying to get a bass sound more in-line with the Klipsch (more than anything else). For $250 for a sub you are pretty restricted and may be better off saving a bit. I would avoid the B&W subs (not very good, had one), but think that with these speakers you would be well served by one of the REL Quake subs (starting with the Q106? and going up from there based on available budget).
The REL's are much better subs than most others in this price category (at least in terms of real bass control vs. just boom, they have good speed and decent extension). If you want the sub to boom (more like the Klipsch), this will be controlled based on locating the sub and the general set-up.