If you notice bass distortion from your car subwoofer, when you turn up the volume on the car head unit, you will need adjust and reduce the gain on the car amplifier. If you don't get take action, you can cause damage to the car subwoofer, so below is a quick guide, including simplified instruction on how to tune a gain on the car amplifier, that is powering your car subwoofer:
1)Using the appropriate tools if required, turn the gain all the way down on the car amplifier.
2)Adjust the volume on the car head unit to a suitable listen level, insert a CD and play a track.
3)Now increase the gain on the car amplifier carefully, keep increasing the gain and stop increasing the gain, when you hear any bass distortion from the car subwoofer.
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