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Cars & Coffee Killer
Join Date: Sep 2004
Location: State of Failure
Posts: 32,246
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Speaker Box Project
Last year I was wandering Menard's and came across a damaged sheet of 1" MDF. I bought it and decided to build some speaker boxes from it. I had some old speakers left over from a car audio project for a car that I no longer owned. I ended up buying some 1/2" MDF for partitioning inner chambers as well. These suckers weigh about 80 lbs each.
  I used 6.5" Blaupunkt speaker with built-in tweeters. Below is a 12" Sony subwoofer. The speakers actually have three sealed chambers in them. The bottom chamber has the 12" subwoofers with 12" passive radiators on the back. The top-front chamber has the 6.5" speakers with 6.5" passive radiators. The top-back chamber houses the crossover and the hole for the wire clips. I painted them with flat black chalk paint (figured it would show imperfections less).  They sound AWESOME. I'm so happy I'm considering buidling a custom center channel now with some leftover single speakers that I have laying around....
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Some Porsches long ago...then a wankle... 5 liters of VVT fury now -Chris "There is freedom in risk, just as there is oppression in security." |
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09-08-2019, 12:14 PM
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Join Date: Apr 2002
Posts: 30,437
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Nicely done!
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09-08-2019, 12:54 PM
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Registered
Join Date: Jan 2005
Location: los angeles
Posts: 3,105
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You're not saying how you arrived at the dimensions and internals of your enclosures. I started a similar project with some vintage JBL 14" woofers. Who makes enclosures with 14" openings? No one. So I got a circle jig for my router and did that. Done? No. Looked into it further and found books on speaker enclosure design. Turns out there is quite a bit to it. The dimensions, volume, whether to port, and if so, how, all depends on your driver's Thiele/Small parameters. Hopefully you can find these parameters in a database somewhere. Design software may include them. For instance:
https://www.parts-express.com/bassbox-6-pro-software-cd-rom--500-923 I bought a book and did the math manually. Pages and pages of it. Not doing this again... 
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Reparations for neanderthals! '70 914-6, 1965 Mustang GT - RIP, '74 911, '01 Box S '12 Ducati 848 Evo - RIP, '16 Yamaha R1, '13 Aprilia RSV-R |
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09-08-2019, 03:19 PM
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Cars & Coffee Killer
Join Date: Sep 2004
Location: State of Failure
Posts: 32,246
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I figured that with passive radiators (as opposed to tuned ports), it matters less what the exact volume of the internals are. In other words, I intentionally went with a design option that didn't require too much research/thought.
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Some Porsches long ago...then a wankle... 5 liters of VVT fury now -Chris "There is freedom in risk, just as there is oppression in security." |
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09-08-2019, 04:31 PM
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Registered
Join Date: May 2013
Location: Space Coast
Posts: 5,259
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How about the crossovers? Did you have those laying around too? And how did you determine crossover frequencies?
Cool project. |
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09-08-2019, 04:43 PM
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Cars & Coffee Killer
Join Date: Sep 2004
Location: State of Failure
Posts: 32,246
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I ordered some cheap crossovers from Amazon. (I didn't have any laying around.)
https://www.amazon.com/gp/product/B002RE9P0I/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 They weren't allowing the 6.5" speakers anything more than the highest frequencies, so I bypassed the crossovers for the 6.5" speakers. I have some bass blockers that cut off below 150 hz laying around, but I haven't attempted to use them yet. This is a total "seat of the pants" project and not anything that was rigorously researched. I honestly expected to toss them in a garage sale and have been pleasantly surprised with the outcome.
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Some Porsches long ago...then a wankle... 5 liters of VVT fury now -Chris "There is freedom in risk, just as there is oppression in security." |
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09-08-2019, 04:52 PM
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