let's see...there are two possible cases:
1) where there is useful bass information in the .1 channel that you want to preserve (and you don't want to muck it up with bass from the other channels -- the double bass issue); and
2) where there is no useful bass information in the .1 channel (the producer might have used the .1 channel for something other than bass frequencies) -- so the only deep bass comes in the other 5 channels.

in case 1, couldn't you use the icbm to remove all of the below 80 hz frequency information in the 5 channels before it even got to the 950 -- hence the 950 couldn't add it to the .1 channel, because the icbm would have removed it in the first place?

in case 2, you'd want the under 80 hz informaton in the 5 channels to be sent to the .1 channel, so you'd let the 950 do its thing.

i understand that you really can't turn off the bass management feature of the 950 -- all you can do is decide whether you keep it in the 5 channels (and the .1) or just send it to the .1

as long as the icbm can take the sub-80 hz information out of the 5 channels before it gets to the 950, there should be no problem.

right?