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Balances the loudness of the Subwoofer relative to the Front speakers and compensates for room effects on the Subwoofer’s output. It should not be necessary to set the level control to maximum volume to achieve a well balanced installation, but you may need to adjust when changing between music CD's and DVDs. Important: Use Option1 or Option 2, but not both. OPTION 1. Connection with speaker wire -Connect speaker wires from the Receiver’s front left and right speaker outputs to the Subwoofer’s S