Outdoor Sump Pump Basin 12" Subwoofer - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 6 Old 05-23-2020, 01:57 PM - Thread Starter
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Outdoor Sump Pump Basin 12" Subwoofer

Hey guys, just finished a fun little project this weekend, an outdoor subwoofer built from a 22 gallon sump pump basin from the home depot. Easiest sub I've ever built and it sounds fantastic. Not to mention it was actually quite inexpensive as far as sub builds go. Check out the pics below and feel free to ask any questions if you'd like. For now I'll just post some quick specs but will be happy to write a more complete write-up if anyone's interested. It's not the prettiest thing in the world, but it's also not really meant to be seen. But it can certainly be heard! I haven't taken any measurements of it, but might try and do so. The real trick will be seeing how long this thing lasts against the elements. Time will tell I suppose.

12" Audio Pulse Epic Aluminum Cone Subwoofer - parts express - $75
22 gallon sump pump basin - home depot - $23
Net 2 cu.ft. internal volume, sealed enclosure
2x4 foot by 3/4" pre-cut MDF - home depot - $15
4-Pole speakON Cable Connectors - Amazon - $10
brown spray paint - home depot - $4
Glue, polyurethane, screws, speaker wire, etc. - $20
Driven by a 100W (50+50 to each voice coil) Russound R235LS amp - craigslist - $20
Optimus 12-2011 (good ole' RadShack) active crossover 90 Hz low-pass - craigslist - $15

(Sorry about the order of the pics and some of the orientation, I just dragged the pictures in and they showed up like this, not sure how to fix it)
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Last edited by aktiondan; 05-23-2020 at 11:30 PM.
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post #2 of 6 Old 05-23-2020, 04:15 PM
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and an outdoor projection screen to go with it?
(Night-use only, obviously...)
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post #3 of 6 Old 05-23-2020, 05:05 PM
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Nice work. Very creative!!!

Automation: Alexa- Harmony Hub- Wemo Dimmer Switch- Wemo Smart Plug BatCave: SY Triple Black
Video Image: JVC RS500- Sony UBP-800X- Chromecast- 125" wide 16x9 white over black spandex screen
Audio: 5.2.4 Marantz SR7011- (LCR) QSC 2180 - (Surrounds) (4) BIC FH6-LCR- (Atmos) (4) Dayton Audio B652 6-1/2-Inch- (Subs)2 23ishcuft ported HS24s 14-15Hz tune - 2 Devastator Minis B&C21ds115 - 4 PA460 in ported cabs 40Hz tune- FP20000Q- 2 Sanway FP10000Q- Crown XLS1500- . To be continued...
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post #4 of 6 Old 05-23-2020, 06:54 PM
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Awesome!

We are debating redoing our deck, and if we do, I’m thinking about a buried sub using two of those containers bolted together with a external port sticking above ground...


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post #5 of 6 Old 05-23-2020, 08:23 PM - Thread Starter
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Yes, doing the whole dive-in movie thing is definitely on the list. Not quite sure the logistics yet of putting a projector near a pool though with teenagers/kids splashing around. An IP67 rated projector anyone? Plus tapping into to the amps that drive these speakers might be tricky with my setup. The kids have already asked for it though, so we'll have to figure it out. But this sump pump basin as a sub enclosure is unbelievable, it is absolutely rock solid. I think I read on the forums here that a guy did this before, which is where I got the idea. But I couldn't find a whole lot of additional info about it though. I added the two extra MDF pieces, one to brace the bottom (or with it flipped around now the top) because that's really the weakest spot. The extra ring in the middle just tightens it up a bit more. The main baffle I made a smidgen oversized and then glued and hammered it in within an inch of its life, it's never coming out and just really reinforces the whole thing so it's solid. I have never built a classic sonotube sub, but have been reading about them for as long as I can remember. This enclosure is 1/4" fiberglass, so it's already pretty beefy, it doesn't need much extra bracing. There are no nails or screws either to ensure it stays completely waterproof (except the screws holding in the driver and the speakon connector).

Note they don't stock these at home depot, you have to order it online and then go pick them up in the store (for free or pay to ship to your house). They make a bigger one too (it's 30 gallons), but for a small sealed 12" driver, this size is perfect, plus it's not that hard to hide in the yard. Two of these bolted together and ported would be awesome. I wouldn't want to dig the hole to bury that beast though! Music takes on a whole new feeling with some low end, even if it's not super loud (not trying to annoy the neighbors) but at low levels hearing a low beat drop in an open area like a backyard is pretty sweet.
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post #6 of 6 Old 05-23-2020, 11:12 PM
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The screen would probably have to be motorized and raise up out of the ground to prevent the wind from ruining it when not in use. Or you'd have to have a wind protective structure for it, something like this:


They also make ultra short throw 4K projectors which could be contained in the same structure as the screen, ceiling mounted.
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