There aren't a lot of folks out there putting an ICBM between 950 and amp (the ICBM's bass management is not significantly different from the 950's digital bass management, although it does offer the ability to operate stereo subs). How do you have the DefTech's connected? That might be a deciding factor in the ICBM wiring. According to
this recent thread , DefTech recommends running them large with the subs connected to the LFE output, but I would think it would be preferable to run the unpowered portion of the speakers small (the 2300 uses 4-1/2" drivers for the midrange, which would seem best suited to being operated as "small"). Does anyone know if there is some internal crossover feeding low frequency data from the binding posts to the powered sub? If there was, that would explain the preference for running them large while also connecting the powered subs to the pre/pro's LFE output.
No matter how you have the LCR's wired, there is one option that may work for you while still routing all channels through the ICBM. Set the 950's surround back to use the LB only (Stereo6), connect the left surround back output to the center surround input on the 950, and split the center surround output to feed both back channels of the 7100. You lose nothing by doing this (except individual trim control for the left and right back speakers) because Dolby EX, DTS ES, and Cirrus Extra Surround all produce a mono surround back signal, so both speakers get the same info either way. I'm doing this currently -- when we moved last month, I went from 6.1 to 7.1 briefly, only to find that my Parasound two-channel amp has become a monoblock (right channel only works occasionally), so I switched the 950 back to 6.1 and connected the surround back speakers to the A and B left channel outputs. Eventually I'll replace the Parasound (probably with a pair of M200's), but for now I've got 7.1 in speakers and 6.1 in amps/processing.
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