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<blockquote data-quote="keep_hope_alive" data-source="post: 7366091" data-attributes="member: 576029">in open spaces, loading boards tend to work very, very well. i&#039;ve done subs under the captian&#039;s chair in pontoon boats in 4th order bandpass that worked great.&nbsp; bandpass also do well in open spaces, as do horn loaded enclosures.&nbsp; if it works for pro-audio, it works on a boat.&nbsp; traditional car audio sub designs usually fail on boats since they rely on cabin gain.de-coupling the enclosure, then framing out the inside of that 3-sided aluminum cavity with 3/4 ply (or two layers with Green Glue between) would eliminate the flexing of those panels, and focus more bass energy out of the opening - toward the passengers.bass wants to go everywhere, you can control it with dense, rigid materials.&nbsp; from that location, you really only want the energy to go horizontally out toward the boat passengers - which means it has to travel through the seats.&nbsp; reinforcing the sides (and top) would get you that directionality.your main problem is that as long as you fire the sub into a panel and/or surround the sub with aluminum panels, they will rattle.&nbsp; if you put ply between the sub and your passengers, you&#039;ll lose output.you could frame all four sides but leave an opening that essentially tuned it for a 4th order bandpass, assuming that opening faced the passengers and the tuning was appropriate, you&#039;d get great performance and output with minimal vibration/rattles.&nbsp; that&#039;s what i would do.i would build a properly tuned 4th order bandpass that had vents that went under the rear passenger seats and flared out just above the floor (angled toward the floor so no water ingress was possible).&nbsp; then all of your bass energy would be right there in the cabin and would spread spherically from there (with some corner loading off the floor and seats). the enclosure and vent would be fully de-coupled from the boat and the cavity that held the actual enclosure would be reinforced with multiple layers of ply.if you&#039;ve never heard a properly tuned and constructed bandpass enclosure in a convertible or boat, you&#039;re missing out.</blockquote>

[QUOTE="keep_hope_alive, post: 7366091, member: 576029"] in open spaces, loading boards tend to work very, very well. i've done subs under the captian's chair in pontoon boats in 4th order bandpass that worked great. bandpass also do well in open spaces, as do horn loaded enclosures. if it works for pro-audio, it works on a boat. traditional car audio sub designs usually fail on boats since they rely on cabin gain. de-coupling the enclosure, then framing out the inside of that 3-sided aluminum cavity with 3/4 ply (or two layers with Green Glue between) would eliminate the flexing of those panels, and focus more bass energy out of the opening - toward the passengers. bass wants to go everywhere, you can control it with dense, rigid materials. from that location, you really only want the energy to go horizontally out toward the boat passengers - which means it has to travel through the seats. reinforcing the sides (and top) would get you that directionality. your main problem is that as long as you fire the sub into a panel and/or surround the sub with aluminum panels, they will rattle. if you put ply between the sub and your passengers, you'll lose output. you could frame all four sides but leave an opening that essentially tuned it for a 4th order bandpass, assuming that opening faced the passengers and the tuning was appropriate, you'd get great performance and output with minimal vibration/rattles. that's what i would do. i would build a properly tuned 4th order bandpass that had vents that went under the rear passenger seats and flared out just above the floor (angled toward the floor so no water ingress was possible). then all of your bass energy would be right there in the cabin and would spread spherically from there (with some corner loading off the floor and seats). the enclosure and vent would be fully de-coupled from the boat and the cavity that held the actual enclosure would be reinforced with multiple layers of ply. if you've never heard a properly tuned and constructed bandpass enclosure in a convertible or boat, you're missing out. [/QUOTE]

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