Need help building a custom box for a boat!

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I am trying to build a custom sub/speaker box for my boat.*

I have never built a custom box so I could use all the help I can get.* I'll post pictures of the existing box that I'm planning on replacing.*

It is going to be the base for the rear seats, so one of my major concerns will be moisture as wet people will be sitting on top of it.*

I am planning on 2 6" speakers on the ends and 4 10" subs in the center.*

I will be running a 2 channel amp for the subs.* Will the box need to be ported or is sealed better?* Does each sub need to be sealed or can 2 go on one side and 2 on the other?*

Next question, what kind of wood should I use and what is the best option to waterproof it?* I was thinking bed liner but I'm open to options.* I plan on having the box wrapped* in upholstry as I'm having the whole boat reupholstered, so looks aren't much of a concern.

Thanks for all the help!



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