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What's the known sub tweak? (I'm not sure if it's 'known' to me... )



Not really a tweak, more of an inconsistency. Don't make me say "bug". Some versions Audyssey processor has trouble interpreting the distance of an EP500 or EP600 sub because it has trouble with whatever the sub's DSP technology does to it's output. It sets the distance for the sub way too far back and thus cranks the db adjustment way to high.
Somebody somewhere explained exactly why but I never have luck with details searches.

Don't know what versions or models create the bad mix but it happened with my Denon 3608 and an EP500. A very minor thing. I love both the receiver and the sub.

With great power comes Awesome irresponsibility.