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Outdoor speaker building material "Extira" Thoughts?

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  • Outdoor speaker building material "Extira" Thoughts?

    I want to build another outdoor subwoofer. Currently, I have (2) 12" drivers in a sealed MDF box coated in two coats of clear polyurethane and then two coats of Rust-O-Leum bed liner spray. It is outdoors but under cover on my patio and it has held up really well for over two years so far, no swelling, cracking or warping. However, now I would like some boom by the pool and I am afraid my previous MDF building technique will not hold up to daily rain, sprinklers and splashing by the pool.

    About a year ago I built a sub for a friend with birch ply from Home Depot and covered with two coats of clear poly and a thick coat of textured deck paint. Sadly, in less than a year, water somehow found its way under the deck paint/polyurethane and started warping and cracking the plywood. I was really dissapointed as the birch ply was pretty expensive and it didn't last long at all. I don't want to repeat the same mistake on my pool sub build.

    A guy I know builds signs for a living an recommended Extira. Has anyone built an enclosure with it? It is a type of MDF that is supposedly waterproof even if unfinished. I'd like to try building a box with it if the gurus here think it will be okay. http://www.jwlumber.com/wp-content/u...e-Brochure.pdf

    I already settled on a driver, an 18Sound 18LW2400 18" that is advertised as suitable for outdoor use. I found it as an open box deal really cheap locally and there are plans for it on the 18Sound website.
    Eco-friendly Extira is a treated exterior composite panel building product that is moisture resistant, rot resistant and termite resistant.

  • #2
    Looks like a great product for the application, however limited availability.
    http://www.extira.com/where-to-buy/

    if you can buy it for a reasonable cost, give it a try! I'd give it a swell test, take a small sample and measure thickness with calipers, then soak it in water overnight and see what the thickness is in the morning.
    Don't waste your money on a new set of speakers, You get more mileage from a cheap pair of sneakers. Next phase, new wave, dance craze, anyways it's still rock and roll to me!

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    • #3
      Here's a thread on the product with some info and helpful hints.

      http://www.talkshopbot.com/forum/sho...xtira-Vs-Medex

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      • #4
        That looks like an excellent material, but what if you made the box out of extira and covered it with a countertop solid surface material such as corian?

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        • #5
          Originally posted by ugly woofer View Post
          That looks like an excellent material, but what if you made the box out of extira and covered it with a countertop solid surface material such as corian?
          I'd love to build the whole thing out of corian but that is some expensive stuff! My dad was a custom cabinet maker and corian counter tops were often times more expensive than granite!

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          • #6
            My 2cents, there are MDF products that I have used multiple seasons outdoors. Also MDO plywood which is used for roadside signage. Proper edge sealing
            ​as your first concern then from there, oh yeah did I mention the importance to seal the " Edges" completely . Epoxy like West systems is more than adequate
            ​but you have to build up a film to encapsulate the edges of any sheetgood for long term outdoor durability. Then a good exterior paint or the finish of your choice

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            • #7
              What about fiberglass, or fiberglass covered plywood, like a boat I guess. I would also go sealed or passive radiator sealed tight of course. You can get bigger packages of the silica moisture absorber online. I'd throw some packs inside as a just in case..

              Love your avatar by the way! Is that a stock photo or your amp? If it is yours what is it?
              Projects:

              transcenD: http://techtalk.parts-express.com/fo...5035-transcend
              Summits: http://techtalk.parts-express.com/sh...75-The-Summits
              References: http://techtalk.parts-express.com/sh...-My-References
              Vintage Style 2-way: http://techtalk.parts-express.com/sh...-vintage-2-way

              Comment


              • #8
                Originally posted by dynamo View Post
                What about fiberglass, or fiberglass covered plywood, like a boat I guess. I would also go sealed or passive radiator sealed tight of course. You can get bigger packages of the silica moisture absorber online. I'd throw some packs inside as a just in case..

                Love your avatar by the way! Is that a stock photo or your amp? If it is yours what is it?

                good ideas!

                Sadly, my amps don't glow very bright, I have Cary CAD-300se running JJ 300Bs, hardly any glow. :(

                The avatar is a stock photo of a guitar amp: https://s-media-cache-ak0.pinimg.com...baad904ec2.jpg

                Similar photos:
                https://www.google.com/search?q=tube...9Rqu&*&imgrc=_

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                • #9
                  Can't beat the look of a 300B tube though!

                  I wonder if it is some sort of timed exposure. I looked at the similar photos you posted and see some even capture the blue hues. Mine are Tung-Sol el34s in my primaluna and are about as bright as they get without some fancy camera work..
                  Projects:

                  transcenD: http://techtalk.parts-express.com/fo...5035-transcend
                  Summits: http://techtalk.parts-express.com/sh...75-The-Summits
                  References: http://techtalk.parts-express.com/sh...-My-References
                  Vintage Style 2-way: http://techtalk.parts-express.com/sh...-vintage-2-way

                  Comment


                  • #10
                    Another option could be "cellular PVC" trim sold at the big box stores. It's flat and definitely rainproof since it's meant for the outdoors. I'm just not sure it'd be stiff enough for a sub box.

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                    • #11
                      Just an update. I had some trouble locating Extira locally. I found one place that wanted $109 a sheet and a $45 delivery fee. After a few hours I found a 'wholesale only' place that would sell to me cash but also charge sales tax but cost only $80 a sheet and I could pick it up. I bought 2 sheet to try out and so far it cuts just like regular mdf but it has an oily feel to it. I am about 75% finished with my sub build, I'll post some pictures soon.

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