I would have thought you would have placed the ICBM between the DVDA/SACD player and the Yamaha, since then how do you get the ICBM out of the way for normal material via digital inputs and stereo analog input where the Yamaha does the bass management? Are all speakers simply set to large?

As for with the 990, I would expect the ICBM to become unnecessary, since the 990 can do bass management on the multichannel analog input as well as the digital inputs and stereo analog inputs. Or I guess you could go the all-large route and still use the ICBM. But what does it offer you in functionality versus the 4-way crossover setup of the 990?