Boat sub enclosure help

[kerpit 10+ year member]

I have a 19 foot open bow boat and i installed the sub (alpine type r 1242d) a few years ago in the very front of the bow facing upwards right under a seat. I blocked off the front area from the side storage compartments so it would be a sealed enclosure. It seemed to me that the seat cushion right on top of the sub cone was really inhibiting the sound so i raised the seat so there is a 3/4 gap between the seat cushion and the sub and it made a decent difference. This year i was wanting to create this space which is 1.7 cubic feet volume i measured by filling with water, a ported enclosure at 33 hertz. Where will most of the sound be emitted from the sub? Does sound actually come from the port or only used as a resistance to cone movement? I just want to get the most out of this space, i have no other areas to place a sub. Or is there a way to reflect sound from the under side of the seat instead of it muffling it? What would you guys do with this space?

View attachment 26524129

thanks for any input!

-Brian

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[kerpit 10+ year member]

View attachment 26524130picture of seat on top of sub

 

[xxkylexx 10+ year member]

personally i would face it towards the back of the boat like towards the cpts. chair and have my ports going straight up to your 3/4 inch gap but thats just me. or maybe instead of customizing it into the seats just get a regular ported box and place it in back it could double as another seat hahaha

 

[Buck 5,000+ posts]

I wouldn't do a ported box in a boat like that because it's an open environment and the sub probably wouldn't last that long.

 

[xxkylexx 10+ year member]

what kind of sub is it?

 

[xxkylexx 10+ year member]

cuz if you have it ported the sub will credate more excursion which means more air flow which means louder in a open environment like that

 

[Buck 5,000+ posts]

cuz if you have it ported the sub will credate more excursion which means more air flow which means louder in a open environment like that

Not exactly. The way I see it is that there is no cabin gain and nothing for the port to load off.

 

[PhishHead 10+ year member]

I'd say do a 4th order.. I think you would get the best sound out of that type of enclosure.

 

[Buck 5,000+ posts]

That works too.

 

[PhishHead 10+ year member]

Especially when using a 4th order you can drop the seat back down and should have better sound than before.

 

[Cali_Screw 10+ year member]

i did this to mine, not sure how much room you have in these spots but here is a idea..

Each have 1.75 cubes ported to 35 hz, port fires to the side of the boat. suckers get loud for only 800 rms

 

[09civic 5,000+ posts]

^^ nice

 

[kerpit 10+ year member]

the sub is an alpine type r 1242d. i can't put the sub under the helm or port side, i would love to but i use that space already. I can't face the sub parallel to the floor because there is not enough space to mount it. I Love the 4th order bandpass, so do i build the enclosure so the port is facing towards the rear and not deal with the seat? And what volume am i shooting for? I only have specs for sealed and ported.

-Brian

 

[benjdow 10+ year member]

oh wow...something I know about. Allow me to share my experience. Ironically, I had to exact same sub you had the last 2 seasons on my boat. I think doing a sealed enclosure is kind of a waste. You definitely want ported if you want output. If you have a ported enclosure on a boat the best place to put is under the driver or passenger console with the sub and port firing at the hull. If you can't use this space for a sub than I wouldn't waste time trying other options. Ported will be fine as far as moisture...just epoxy resin the box inside and out. You want to tune the port higher on a boat than you would in a car. Sub firing into open enviornment won't produce the results you're looking for. I'm installing a Sundown Z15 v.2 on my boat atm 3.25^ft @ 35hz, can't wait to see how that does at party cove //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif