Yike! That's a lot of shuffling around. The way I read the manual, the ICBM can not do exactly what you describe (although what it will do is probably likely to give you the same result as what you are trying to do). To achieve exactly what you are describing, you would almost need two layers of bass management -- a device like the ICBM crossing your center and surrounds to your mains, and then another device (a second ICBM or a Paradigm X-series sub controller, for example) crossing over the summed main channels to the sub/LFE (and what that would do to signals, phase, time delays, and such, I have no idea -- others around here are more knowledgeable on such matters). What the ICBM will do if the recombine switch is used is redirect the bass from the center and surrounds to the mains. It will be possible to subsequently crossover the mains to the sub at whatever frequency you want, but the mains will still get a full-range signal. For what you are looking to do, using the recombine switch and setting the crossover on your mains around 40Hz or 60Hz should work fine -- the mains will still get a full-range signal, but they won't really be doing much in the area below their crossover point since they are -3dB at 35Hz anyway.

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