my understanding of the icbm is that you can set each set of speakers different, what it does is, you would set the crossover on say for example your fronts have a good size woofer or say two 8's, you might set the crossover at 60, say your center has one 5 1/4 or 6 inch woofer you might set that to 80 or 100 and so forth, what is does is lets you set the crossovers so that a speaker that can't or won't handle big bass is not really fed big bass, I had mine between my player and reciever, than I got the 7125 and now have it between the reciever and the amp and it seems to be a great help.hope I answered your question.