Cam, there's no way to manually "tweak" the many adjustments that Audyssey makes in the frequency and time domains. The one option that the Denons include is to select either the "Audyssey" or "Flat" curve. They're identical except that the "Audyssey" curve includes a small high frequency roll-off(2dB per octave above about 4KHz as best as I can tell)which can be helpful on some material with an over-emphasis in the high frequencies.

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Enjoy the music, not the equipment.