SoundMax SM-CMD3009 - Manual (Page 18)

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ON/SUB OFF. Or press and hold BND/NP/SUB button on the panel to switch on or off the subwoofer output.
After you have reached your desired effect, leave the unit idle in order for the new setting to take effect.
Note: An external amplifier is required to operate the subwoofer.
AUX in jack
AUX-in jack is intended for connecting external audio equipment to amplify the sound. If connection is made
correctly, the audio signal from the external source will be translated through the acoustics of the head unit.
This enables to adjust the volume and quality of the sounding. For example, you can connect an MP3-player
to listen to tracks using the car acoustic system.