Box design sketch (pics)

[Ornlu]

Hmm, well here's the design for my 10 inch driver box. Just mocked it up. Will take a little more than 4' x 4' sheet of mdf 3/4.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

Are the braces good? Should the rear one be off center?

 

[planet10]

Should the rear one be off center?

All braces should be off-centre... the use of irrational numbers to create the ratios is a good tool... it is even better if you can make the braces oblique (ie dividing panels into trapezoids instead of rectangles). A brace that is in a position to wedge the mahnet against is also a good idea.

dave

 

[Ornlu]

How much of a difference will it make? I mean, I thought that the 1/2 wavelength of anything a subwoofer produced would be too big for resonance/standing waves in the box anyway. It's just that centered they provide the most structural support.

 

[planet10]

How much of a difference will it make? I mean, I thought that the 1/2 wavelength of anything a subwoofer produced would be too big for resonance/standing waves in the box anyway. It's just that centered they provide the most structural support.

That last is not true, an oblique brace will provide greater structural support

In the case of the panels, the internal pressure will cause the panels to start to move... if the brace is in the centre, you can actually increase the size (and "tune") the resonance because you are giving the energy a path of least resistance..

dave

 

[BassAwdyO]

judging that the speaker is 10" your box is probably no bigger than 16"x16"x16" and probably doesnt need any bracing at all IMO. A brace in the middle will be much easier to build than an oblique one and I say go for that.

 

[Ornlu]

Yeah, that's the thing. Maybe if the box was huge. But it isn't It's 16.5^3 outer dimensions approximately. It also has a double faced front and will have two internal braces. Vibrations shouldn't really be a problem.

 

[planet10]

Even at 16^3 a brace that pushes against the magnets is a good idea (and the most important one)... and if you are going to add a brace, off-centre is no harder (oblique certainly is i agree). Even a half inch makes an improvement. If you are doing it, and it is no harger, why not do it right?

Example below to just give an idea....

dave

 

[Ornlu]

Ok, the center brace I was planning on having 1 inch towards the back because the front is double faced anyway. Why is the support on the magnet the most important? Just out of curiosity. I'd be afraid of it buzzing or transfering mechanical vibrations directly to the box.

 

[planet10]

Ok, the center brace I was planning on having 1 inch towards the back because the front is double faced anyway. Why is the support on the magnet the most important? Just out of curiosity. I'd be afraid of it buzzing or transfering mechanical vibrations directly to the box.

The idea is to spread mechanical vibration to all the panels... otherwise it is all in the weakest panel of the box... the baffle (even at double thickness)

Better yet is push-push (ie active vibration cancellation) -- i usually don't build without it any more.

dave

 

[brainsahead]

Sealed or nt

is the encloser sealed or bandpass
waiting for ur reply buddy

 

[Ornlu]

Enclosure is sealed, and finished..
http://forums.overclockersclub.com/Sub_Enclosure_All_Finished_And_Painted_pics-t53656.html