I plan on putting my ICBM after the 950, and I don't think time alignment will be an issue. Correct me if my logic is faulty.

I am setting the center and surround crossover point at 60, 80, 100 - whatever works. Then set for no sub. Not sure exactly this is done in the 950, but I'm sure there is a way to send all bass material to the mains.

The 950 center and surround output go directly to the amps, but the main L/R goes to the ICBM first, using it as a stereo crossover for the main outputs. There I set the main crossover to whatever I want (60 or 80 Hz most likely). No recombining of delayed bass to send to the sub, just a redirection of the bass in the mains, which is all of it since I set the 950 for no subs. I can have stereo subs, or mono - the ICBM can do either.

In the past, I have had very good success with slightly different crossover frequencies for the HP (to mains) and LP (to subs). I can do this by splitting the main L/R signal out of the 950, and sending a full range signal to the sub and use my sub's continuously variable LP crossover for the bass. Now I have independently variable HP and LP crossover points.

I also want to have the option of 4th order L-R crossovers for the mains. The ICBM only allows 2nd (12dB) order Butterworth HP, and either 2nd order or 6th order or LP. But... with the set up described above, I have lots of unused inputs available on the ICBM. So I can set the ICBM for 12 dB HP and LP. Take the main L/R outputs and feed them into the L/R surround inputs. The surround outputs are now actually the main L/R signal filtered by 2 cascaded 2nd order Butterworths. There you have it - a 4th order (24dB) L-R crossover! In case you are unaware, a 24dB L-R is 2 cascaded 12dB Butterworths.

So if you think about it long enough, the ICBM is a VERY flexible box, particularly if you aren't using it to cross over all channels of your HT system.

Did this make any sense?

Cheers,
Chris