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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 7398435" data-attributes="member: 576029">pics will help.  sealed boxes don't perform well on boats. i treat boats like i do rooms.  i use ported or usually bandpass and i ensure the ports play to the seating area.  a fiberglass sheet is airtight which means little bass gets through.  think of bass like water waves.  bass waves travel a lot like water waves - so something that is water tight is near  bass tight.  now, bass can travel through materials, but inefficiently.  you want your sub to play to the seating area so air can travel from the cone straight to your ears.  a bandpass lets you just make a port hole that can be turned up inside the box to prevent water ingress.pics would help.</blockquote>

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