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Amp/sub help please


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Need a little help, installed Rockford amp/sub this winter. Had my sub dialed in and sounding great with boat off. Finally got on the water and holy crap! Super loud with boat on. Wired amp direct to battery. 2019 Axis A20, 2 batteries. Should I have wired to the switch instead? Do I need a capacitor? If I dial it all the way down when boat is running on the head unit, it’s too quiet with boat off in accessory. Any wiring advice so I don’t have to adjust it every time I turn the boat on/off?

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Are you talking about engine noise from a ground loop? Popping noise surge when starting the boat ?

how is your head unit wired? It should be wired to the same location your amps are for + and - . 

If they are wired to separate distribution blocks for + and - I bet that’s where you have a ground loop and noise is getting into your system 


Edited by Stevo
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Got a little help from Facebook, sound like it might be “Auto Volume” in “Settings” on the boat’s LCD rathe than the head unit 

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