Sony STR-DN840 Quick Setup Manual page 10

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Next, plug the supplied
optimizer microphone into the
AUTO CAL MIC jack.
Place it roughly where you would
normally sit, and at ear level – on
the back of a sofa, for instance.
Confirm active subwoofer setup.
When a subwoofer is connected,
turn it on and turn up the volume
prior to activating it. Turn the
subwoofer's LEVEL dial up about
1/3 of the way.