When using the auto-on/off feature, please follow these rules: If you want the sub woofer to come on when there is a low level signal present, you should have this switch set to the ON position. When the sub woofer is active, you will see a GREEN light. When the sub woofer is not active, you will see a RED light. If you have the Auto-On/Off switch set to the OFF position, the sub woofer will only come on or go off when you press the power button on the unit itself. Set the High/Low switch to LOW, if you want your sub woofer very sensitive, and on HIGH for less sensitive.
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