Michael, you should also study the Audioholics info that Joe linked, which is quite good for the most part. Basically, the problem is that most receivers, including most "7.2" models have only one sub output internal circuit and can't make different distance and level settings(if needed)for two connected subs. So, that should be done manually before running Audyssey room EQ. Then Audyssey EQ can be run with the two subs operating simultaneously.

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Enjoy the music, not the equipment.