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Backyard Theater - Outdoor Movies

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Author Topic: Outdoor Subwoofer Bench  (Read 21598 times)
Backyard Paradise
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« on: April 26, 2008, 04:36:13 pm »

Iím thinking I need a little more bass out on the deck. The small 8Ē sub I bought last year was very disappointing. So I want to build something. I originally thought I would mount a sealed box under the deck, but Iíve decided a subwoofer bench would be way cooler! Cool Iíve been working on a design here and there during my lunch for the last few weeks.

I recently obtain a couple of 12Ē infinity car subs. They are an older version of these with the same specs.
http://www.crutchfield.com/App/Product/Item/Main.aspx?g=520&i=1081250W&tp=111

My preliminary plan is to build a bench from cedar and mount the sealed box underneath. The sub box would be made from MDF and will have two separate chambers with a volume of 1.5í each.  The MDF should not get wet, and everything will be sealed inside and out with a marine spar varnish.

So I need to get a sub amp with a crossover. Iím having a hard time choosing one. The prices are pretty high, especially the rack amps. Iím leaning towards a plate amp that will be mounted in the house. Does anybody have any suggestions? What should the minimum watts be? I would like to keep it under $200.

Iím at least a month away from building this due to other priorities, like replumbing and opening the pool. I never built a speaker before and would appreciate your comments.
Check out the picts below and let me know what you think.
Kevin

GO WINGS!


* bench1.jpg (75.49 KB, 1147x706 - viewed 894 times.)

* bench2.jpg (137.36 KB, 1147x706 - viewed 1215 times.)
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kenallwine
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« Reply #1 on: April 27, 2008, 08:36:17 am »

It is a great design!  I would suggest that you keep the subs in two separate air spaces (divider plate).  This way, if one would fail due to moisture or over driving you would not get a passive radiator effect and mess up the sound.  I'm also wondering if a Marine grade subwoofer wouldn't suit you better.  Will the bench itself ever get wet from rain or snow?

As for an amplifier, a rack mount would be the best option as it would give you the most efficient use of power.  With a plate amp, I would believe you would need two as most of the ones I have seen are mono-block amps.

You will have to post pictures of your progress once you start building!
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Ken Allwine
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« Reply #2 on: July 04, 2008, 05:20:27 pm »

Well I finally got the box built for the bench and will try it out at tonightís movie. It will be hooked up to the LFE out on my Pioneer VSX-D3S. I think it will make a MAJOR difference! Grin I tested it out and it pounds pretty hard. It is made from ĺ mdf and jointed with dado and rabbet joints. It has 3 coats of spar varnish incase of moisture. The cedar bench should keep it dry.

Iím powering it with a buttkicker 1100 watt (4 ohms) amp that I bought with a kit that includes an active transducer. The transducer is mounted under the bed for the bedroom theater and it totally rocks the room!

I hope to have the bench built in the next week or so. This thing is Heavy!


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* box.jpg (72.88 KB, 960x720 - viewed 982 times.)
« Last Edit: July 04, 2008, 05:26:42 pm by Backyard Paradise » Logged

Kevin & Deeís Backyard Theater
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« Reply #3 on: July 18, 2008, 11:40:55 am »

So far I built the case and sealed it with three coats of spar urethane. I made it a few inches larger than my design. The top made from 2 x 6 cedar milled to 1 ľ and joined with tongue and groove construction. It is routed, sanded and waiting to be sealed. I need to let it acclimate because the 2 x 6 boards have different moisture content and with the high humidity weíve been having and I donít want to rush it. I still need to come up with good a method of attaching the top to let the wood move without splitting or cracking the case joints. It should be rocking in a week or so.  Having lots of fun building this! Grin


* unfinished.JPG (50.16 KB, 640x427 - viewed 1108 times.)
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cecilb
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« Reply #4 on: July 18, 2008, 11:52:06 am »

So far I built the case and sealed it with three coats of spar urethane. I made it a few inches larger than my design. The top made from 2 x 6 cedar milled to 1 ľ and joined with tongue and groove construction. It is routed, sanded and waiting to be sealed. I need to let it acclimate because the 2 x 6 boards have different moisture content and with the high humidity weíve been having and I donít want to rush it. I still need to come up with good a method of attaching the top to let the wood move without splitting or cracking the case joints. It should be rocking in a week or so.  Having lots of fun building this! Grin



I'm glad you're having fun because it's down right depressing looking at all these posts of pure talent.

Seriously, it's spectacular, Can't wait to get a report on the sound. If you're ever in my area, stop by and bring your tools!

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seating for 1,000........... 12 at a time
kenallwine
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« Reply #5 on: July 18, 2008, 12:08:24 pm »

That's beautiful.  I wish I was that tallented with wood!
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Ken Allwine
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« Reply #6 on: July 18, 2008, 12:11:45 pm »

it is beautiful !!
i used to do alot of woodworking, the first project i ever made was a hutch for my parents family room... i started out big. but then i gave up saw dust for flour dust and started this business.
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Kladder Station Classic Movies - Drive-In & Outdoor Theater
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« Reply #7 on: August 04, 2008, 10:06:25 pm »

Thanks for the complements guys!
The last couple of weekís Iíve had bad karma or something. Maybe Satan put a hex on me! Angry

Everything seemed to go wrong. I got stranded on I-94 in downtown Detroit, my pool pump broke, then pool heater broke, and finally my tooth cracked! I did manage to keep my job, but they walked out 1/3 of my department last Monday. It was one of the most depressing days of my life, watching your buddies get tapped and walked out the door. I got home had some beers and why not, lets raise the screen! Pulling out the projector always makes me feel better! BYT therapy is what I call it!

It took me awhile but I finally got the last coats on the bench and tried it out Saturday. It didnít disappoint! It can be subtle but also pack a punch during the action scenes. Itís just what I wanted. The surround sound on the deck is now complete. I might replace the drive-in speakers Iím using for the fronts in the future, but there OK for now.

Now I need to get going on the other umpteen projects Iíve been putting off. Hereís a few shots of the finished project. Remember, next time you have a bad day. Pull out the projector, youíll be smiling in no time. Grin


* Slide1.JPG (53.21 KB, 960x720 - viewed 1129 times.)

* Slide2.JPG (72.91 KB, 960x720 - viewed 840 times.)

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* Slide4.JPG (69.59 KB, 960x720 - viewed 861 times.)

* Slide5.JPG (68.5 KB, 960x720 - viewed 1000 times.)
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« Reply #8 on: August 04, 2008, 11:06:40 pm »

Beautiful work, Kevin.  And it looks right at home there.

Sorry to hear about all the 'stuff' lately.  Hang in there!  Looks like you poured yourself into this project.

Now, about that transducer...   Grin

Randy

« Last Edit: August 04, 2008, 11:53:14 pm by rfisk » Logged

"Instead of cursing the darkness, light a candle for where we're going.  There's something ahead worth looking for." -- Neil Young


kenallwine
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« Reply #9 on: August 05, 2008, 07:37:23 am »

Nicely done! :thumbsup:
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Ken Allwine
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« Reply #10 on: July 22, 2010, 11:34:43 am »

That is insane man...terrific idea and just a wonderful job constructing it. Just awesome!
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Mackinac Movies
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« Reply #11 on: July 22, 2010, 01:33:06 pm »

Awesome idea, and great construction!  It will sound great back in the corner like that too.

One quick suggestion, how about a small frame & some window screen to keep the bugs off of the actual speaker cones?  Don't want anyone trying to tunnel into the surround or something.
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« Reply #12 on: July 23, 2010, 10:10:32 pm »

hell, i'll give two thumbs up!  you are quite the woodworker.
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satch
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« Reply #13 on: July 24, 2010, 07:48:06 am »

Wow

Awesome

Are you imterested in making one for me and selling?
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Backyard Paradise
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« Reply #14 on: July 24, 2010, 09:23:45 am »

Wow

Awesome

Are you imterested in making one for me and selling?
I could be persuaded if the price was right.
This thing would be a bear to ship though!
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