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.

http://forums.pelicanparts.com/uploa...1567973047.jpg

http://forums.pelicanparts.com/uploa...1567973139.jpg

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).

http://forums.pelicanparts.com/uploa...1567973231.jpg

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....

Nicely done!

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...:mad:

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. ;)

How about the crossovers? Did you have those laying around too? And how did you determine crossover frequencies?

Cool project.

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.