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Old 24th February 2012, 05:04 AM   #11
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Here is one my experiment:

Click the image to open in full size.
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Old 24th February 2012, 05:26 AM   #12
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Just trying to visualise how you would make a speaker. Probably be even easier than what he did in the video… Assuming you want a cube of your own given dimensions, the outside framework could form the outside mould. So you would just need to make a destructible inside mould that could be taken apart and pulled out the driver hole when the concrete was set. Massively reduce the amount of steps necessary.
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Old 24th February 2012, 05:43 AM   #13
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Quote:
Originally Posted by rvrazvan View Post
I don't know why, but i have a feeling that it is better to have a horn with soft walls and high mass.
I certainly wouldn't want a horn that would change its acoustic properties based on the input.
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Old 24th February 2012, 07:30 AM   #14
Ile is offline Ile  Finland
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Quote:
Originally Posted by Silent Screamer View Post
So you would just need to make a destructible inside mould that could be taken apart and pulled out the driver hole when the concrete was set. Massively reduce the amount of steps necessary.
Or even simplier way is to use styrofoam for inside mould and pour acetone from driver hole when concrete is cured. Acetone should vaporize styrofoam.

Here's few pictures of my concrete sub enclosure.

Last edited by Ile; 24th February 2012 at 07:35 AM.
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Old 24th February 2012, 12:05 PM   #15
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I was thinking about it over dinner, you could put that expandable foam inside a heavy duty balloon or form a reducing plug shape like this speaker cavity in the picture, and coat the outside of it with that non stick substance. BTW Nice work on your subbies.
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Old 24th February 2012, 12:59 PM   #16
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I think that a mold made of wax would be a good option.
When the concrete has cured you can heat it and pour it out.

Of course depends a lot on the size of your speaker...
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Old 24th February 2012, 02:07 PM   #17
winslow is online now winslow  United States
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You would probably want to use a silicone rubber mold for something like that.
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Old 24th February 2012, 02:58 PM   #18
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If you used something like say open cell foam board for the inside mold why could you not just leave it in place to handle the back wave?

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Old 24th February 2012, 03:40 PM   #19
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Good idea. But is the foam stable enough?
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Old 24th February 2012, 03:54 PM   #20
puppet is offline puppet  United States
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A guy could make the form interior out of "wonder board" panels. Might provide enough reinforcement by itself to eliminating the need for wire. Just have to seal the adjoining edges well. Add in some bracing for the pour.
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