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-   -   Strangest Box Material You used or Have Seen? (https://www.diyaudio.com/forums/construction-tips/318079-strangest-box-material-seen.html)

stephenmarklay 28th January 2018 08:45 PM

Strangest Box Material You used or Have Seen?
 
I think I should caveat this by adding: That sound great too :)

I suppose you could by a truck load of shoe goo and make that into a speaker with patience but it may not sound great :D

I have seen some corian, concrete, granite, plastic and even cardboard.

Since boxes resonate and we have to deal with that it occurred to me why not start with something that does not resonate much. Or in a frequency that is not a concern.

Rubber? Has anyone made a rubber speaker? I have, In my home gym 4’x6’ rubber horse stall mats. I keep looking at them thinking one day I will cut one of them up and make a box. They would to resonate for sure.

I also have a box of unused cork flooring. Cork inside and out with pressboard In between. I could easily make a box out of that, but use a Baltic Birch Baffle to mount the drivers to, and use a lot of roofing paper or similar to mass load it. This may happen.

How about you guys?

JMFahey 28th January 2018 10:54 PM

Any material will do, (even cheesy plastic) :rolleyes: , as long as you make it thick enough so it can reasonable stand speaker sound pressure without flexing too much and resonating wildly.

planet10 28th January 2018 10:58 PM

In our speaker boxes we aim at pushing up potential panel resonances up in frequency because they become less likely to get excited — if they aren’t excited it is as if they are not there. This requires stiffness, strategic bracing, and distributing driver reactive energy across as much material as practical. Easy to use panel materials that lend themself to this approach are quality plywood and stranded bamboo plywood.

dave

scottjoplin 28th January 2018 10:59 PM

Quote:

Originally Posted by stephenmarklay (https://www.diyaudio.com/forums/construction-tips/318079-strangest-box-material-seen-post5323207.html#post5323207)
I also have a box of unused cork flooring. Cork inside and out with pressboard In between. I could easily make a box out of that, but use a Baltic Birch Baffle to mount the drivers to

I like cork, I have a cork floor. Why don't you give it a go and let us know. I wouldn't bother with the pressboard (whatever that is) just use as many layers of cork as it takes :)

phase 28th January 2018 11:03 PM

HDPE has a very nice resonance, have only used .5” thick.

nigelwright7557 28th January 2018 11:12 PM

I am pretty boring, used 18mm chipboard in my early days (1980's) and 18mm plywood now a days.

stephenmarklay 28th January 2018 11:17 PM

Quote:

Originally Posted by scottjoplin (https://www.diyaudio.com/forums/construction-tips/318079-strangest-box-material-seen-post5323344.html#post5323344)
I like cork, I have a cork floor. Why don't you give it a go and let us know. I wouldn’t bother with the pressboard (whatever that is) just use as many layers of cork as it takes :)


I probably will. Take one for the team :) This stuff is multi layer. I get the wood/paper composite for free :) The inside cork looks like 1/16” the outside looks like about 1/8” with and about that much more thickness of the inside material. So it is probably 3/8” total.

I could layer them and use some green glue in the middle.

The outside finish has a nice clear and if I am carful it may look nice. I bet cutting could be done with large razor knife of sorts. Score and break.

stephenmarklay 28th January 2018 11:31 PM

Quote:

Originally Posted by planet10 (https://www.diyaudio.com/forums/construction-tips/318079-strangest-box-material-seen-post5323343.html#post5323343)
In our speaker boxes we aim at pushing up potential panel resonances up in frequency because they become less likely to get excited — if they aren’t excited it is as if they are not there. This requires stiffness, strategic bracing, and distributing driver reactive energy across as much material as practical. Easy to use panel materials that lend themself to this approach are quality plywood and stranded bamboo plywood.

dave

Thanks Dave for your thoughtful comment. A bit like drinking from a fire hose :)

Your tatic of driving the resonant frequency up is a different take on this. The BBC and UK company’s try to push it lower, out of the ears most sensitive, and critical range for speech and much of the vocal range from 2-5k. How high do you push it and what level of attenuation do you see?

Now excitation is a different matter and I cannot comment with any authority.

I am trying to grasp your thoughts on spreading the load and want to know more :)

Sonce 28th January 2018 11:34 PM

Glass, done it long time ago. Had beaten Waterfall Audio, but they do it better:
Enceintes en verre - Page Selection | Waterfall Audio
Sounds good, too.

scottjoplin 28th January 2018 11:35 PM

Quote:

Originally Posted by planet10 (https://www.diyaudio.com/forums/construction-tips/318079-strangest-box-material-seen-post5323343.html#post5323343)
if they aren’t excited it is as if they are not there. This requires stiffness,

That's the opposite of my experience, fnar fnar


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