AVS Special Member
Join Date: Oct 2010
Location: Somewhere in New Joisey
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Based upon the diagram I'd guess the boominess you're experiencing from your current sub is due to the fact that it's probably cranked pretty high in order to compensate for the size of your room, which is really far too larger for it. The RW-12d should definitely help in that regard, but tuning disparate subwoofers is not the easiest thing to do I'm afraid. Getting them in sync is often a challenge.
Unfortunately ideal placement depends upon a multitude of factors, so it's not really something anyone can say without seeing the room itself. You really need to place them in several locations and see which sounds best, but one thing you might want to consider is placing the KSW 10 close to the listeners and the RW-12d someplace else. Since you're considering keeping the KSW turned down maybe near-field is the best location for that, and then the RW-12d can become the workhorse and be placed somewhere that it will produce the most output.
If you find that the ideal placement has them facing each other then the one pointing away from the listeners might need to have it's phase set for 180 degrees, otherwise it probably won't sound right.
If you take yourself too seriously expect me to do the exact opposite