Yes, set the mains to "large". The pre/pro will not output anything to the sub, but the ICBM will take that "empty" sub input and add in the low frequency information from the mains and pass that combined signal to the subwoofer. Meanwhile, for movies the pre/pro will output the soundtrack's LFE signal only to the sub and the ICBM will continue to add in the low frequency from the mains and send the combined signal to the sub.

Does that help?

------------------
gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review