My $13 project

[edjosh23]

Today I started building my new surround sound speakers using TB W3 871s. I am building 10 sided cubes with free drivers (from a very nice person) and old wood from my last test boxes. The only thing I had to buy was binding posts, and they cost $13. I thought I might as well go all out on the binding posts, since I'm not spending any other money.

Dave (Planet10) suggested building aperiodic enclosures, so I thought I would try it out. Below is a picture of test fitting the pieces of wood. For the aperiodic vent I'm using fiberglass insulation and on either side of it are mesh gutter guards.

I was unable to make a lot of progress because my mom and I are remodeling our garage appartment ourselves. Because of the remodel we have lots of insulation. The gutter guards are old, so they were free also.

I wanted to know if I should line the interior of the cabinet with carpet padding, also free. I read that there should be a clear pathway from the back of the driver to the aperiodic vent, so I'm guessing I shouldn't use too much poly-fil.

If you go to my website there are more pictures of the progress so far.

Thanks,

Josh

[planet10]

Originally posted by edjosh23
I wanted to know if I should line the interior of the cabinet with carpet padding, also free. I read that there should be a clear pathway from the back of the driver to the aperiodic vent, so I'm guessing I shouldn't use too much poly-fil.

Yes on the wall-linings... i like to lightly fill the interior of the box with poly-fluff (or similar)

dave

[edjosh23]

Thanks a lot Dave for all the help and suggestions. I'm excited about this project, neither of my parents know how to even use a table saw, so figuring out all of the 45 degree cuts were difficult, when the ousides were odd lengths like the square root of 2 and another was the square root of 8.

Also how can I come up with a filter for these speakers, I've seen John's, but he says only use it with his boxes.

Thanks,

Josh

[planet10]

Originally posted by edjosh23
Also how can I come up with a filter for these speakers, I've seen John's, but he says only use it with his boxes.

You can do some iterative guesses, but it really helps to have some measurements in front of you as a guide... with Brian doing mic measure boards i expect there should be measuring kit in the "family" soon.

dave

[edjosh23]

Yea, I saw the prototype boards when I was over there, they look nice, I'm sure I'll end up getting one.

Do you think I should just not worry about a filter right now?
Or should I try John's values?

Thanks,

Josh

[planet10]

Originally posted by edjosh23
Do you think I should just not worry about a filter right now?
Or should I try John's values?

Always start with nothing... then try filters, John's is probably a fine starting point.

dave

[jjdche]

Originally posted by edjosh23
Today I started building my new surround sound speakers using TB W3 871s. I am building 10 sided cubes...

Cubes have 6 sides.

[edjosh23]

Originally posted by jjdche



Cubes have 6 sides.

not always, this cube (built by a diyaudio member) is 26 sided. I wanted to build something like that at first, then I decided not to. I thought my box would be even harder since it is sooo small, and I'm 17 and have no one to show me how to work a table saw well.

I wanted the exterior to be low diffraction, and the interior to be have less dips and peaks, I'm guessing I will only have like +- 3db, well I'm hoping. I'm also going to add some wood to the internal sides of the enclosure so they aren't flat and the box will be more of "the perfect box".

I'm slowly learning how to get to use my table saw. Cutting the 45degree cuts that were less than 1.5" on the long side were not going to be easy, but I managed to figure it out.

Thanks,

Josh

[planet10]

Originally posted by edjosh23
not always, this cube (built by a diyaudio member) is 26 sided

Matter of semantics... the above is not a cube. A cube is a platonic solid that has 6 faces, each of which is a square and at 90 degrees to any adjacent size.

The above is based on a cube, but with truncated edges... it would be called an irregular Rhombi-Caduceus.

dave

[planet10]

Josh,

Your cabinet would be called an irregular octagonal prism.

dave