Note: When connecting a factory or aftermarket stereo to the BassPro Nano’s speaker-level inputs, set the button to . SETTING GAIN, ADJUSTING PHASE, LOWPASS FILTER, AND BASS BOOST EN 1. Start with GAIN control set to minimum, and the crossover control rotated midway. 2. Choose music with substantial bass content and turn the volume control on your receiver to ¾ of its total output. 3. Adjust the GAIN control clockwise, listening carefully to the bass output.