1) If you plug your subs directly into the ICBM (which is between the DVD-A player and the receiver), you will only get the subs when using the DVD-Audio player's analog output. Probably not the way to go. I'd set the ICBM up for a single sub, run that signal to the receiver, and leave the subs hooked up to the receiver as they are now.

2) When watching regular DVD's on the DVD-Audio player, you have the option of either (A) using the player's decoder (which will let you use the ICBM for bass management) or (B) continuing to use the digital output (which will force you to rely on the Onkyo's bass management, but will allow you to use the Onkyo's THX processing). I'd leave the toslink connection in place and probably compare the two, but you may find yourself wanting to stick with the player's digital output for movies.

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