River Floating Speaker Box - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 2 Old 10-12-2017, 10:34 PM - Thread Starter
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River Floating Speaker Box

So, I am planning on building a floating speaker/grill combo for floating down the river. I don't plan on spending too much as it is more of a fun project and I already have most everything I should need, but I just wanted some input on orientation/size and box material, and any other suggestions people may have or things I should consider. I have had a basic floating grill for the past few years that has worked great and wanted to spruce it up a bit.

Parts I have:
2 Alpine Type S 6x9
2 GRS 69AS-4 6x9
4 GRS 12SW-4 12" subwoofer
Douk Audio TPA3116 2.1 bluetooth amp
2 ExpertPower EXP12120 batteries

I got everything wired up in the garage free air and it all is working to my satisfaction. I am running both batteries in series to give the amp about 25 volts. I have both alpine 6x9's in series on the left channel and the two grs 6x9 on the right channel, so 8ohms per channel. I have the 4 subs wired in series/parallel to the sub output, so 4 ohm load.

I have been planning on building a 6 cubic foot C shaped box (with room for the grill in the middle), separate boxes for each 6x9, and a separate watertight container to house the batteries/amp.

Something like this just to give you an idea, not sure if the chambers are necessary.

Thought 1: I am planning on going sealed mostly to conserve space as the ported recommendation from parts express is 60% bigger (not to mention being able to make the box watertight), but I was wondering if anyone who has played with these subs before might recommend them ported, especially since power is limited.

Thought 2: Should I put multiple chambers in the sub box or does it not matter since they are 4 identical woofers?

Thought 3: Does orientation matter much in open air? I am assuming I will probably want to keep the 6x9's just facing out (one on each side and 2 on the front), but I was wondering if anyone had an opinion on doing the subs facing out as well directly below them or possibly downfiring.

Thought 4: Material. I obviously want to go as light as possible, from what I read plywood is lighter than mdf, so I was leaning towards that route. Will coat with duratex or something similar, but I plan on the entire box to be floating above the water, so it shouldn't have to deal with much other than splashes. What is the thinnest mdf/plywood you would go on a sub box (remembering they are only powered by a tiny amp with a claimed 100 watt output)
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post #2 of 2 Old 10-13-2017, 11:30 PM
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I would use 1/2” Baltic Birch plywood and seal the inside and outside of the finished box with epoxy resin to fully seal the wood from any moisture. Then you could cover the exterior with DuraTex.

With regards to your amplifier, you may have problems with it overheating if it sits inside a sealed enclosure. You might consider a metal enclosure for the amp so it will conduct heat better than other material choices. If there is a way to attach a heat sink to the amp and attach the other side of the heat sink to the metal enclosure, then you may be OK.

Good luck with this project.

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