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You should add the remote bass control like I am doing. It's a single knob control you can mount up front and allows you to adjust the boost of the subwoofer. It plugs into the JL amp (there is a phone plug jack for it). Also, check the settings on the amp. Infrasonic filter should be on, freq at 30. Bass EQ to ON. "Q" at 1.6, center freq to 60. Amp LP filter to 12db. Filter freq to 80.
Hope this helps.
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