Is this dual system in the same room or divided into different rooms?
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My guess would be that one of the two pairs of Cary amps inverts phase but the other does not. So when you run the two pairs of external amps, the two pairs of speakers are running out of phase relative to each other (i.e., the cones of one pair are moving out while the cones of the other pair are moving in). That would produce the partial bass cancellation and apparent lack of power that you describe.
To fix that, you would have to reverse the plus and minus (red and black) connections to the left and right speakers of ONE of the two pairs of speakers.
Hope that helps,
This 'problem' may be a result of the design of the pre-amp. My ARC SP10 does exactly the same thing. I can not use two outputs to drive two systems at the same time. Connecting a seperate system to the second set of outputs 'loads' the other. Almost like the gross effect of having way too much impedence output from an amp or in speaker wires. But its gross! The only way I can successfully drive two different amps, etc, with it is to use a Y signal splitter from one output. Before you waste a lot of time trying to solve something that is unsolvable, call McIntosh and ask them about their design.