If you have the ICBM downstream of the 950 (between 950 and amp), you could leave the 950 set up for 6.1 -- from the discussions I remember on the 950's decoding modes (CES as well as DD-EX and DTS-ES), the two surround back channels are mono anyway. On the other hand, using the Y-adapters (as recommended by the ICBM's manual) would probably make it easier to balanace all of your speaker levels. Either way, the surround processing of the 950 shouldn't really be affected, I don't think.

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