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  #1  
Old 12th September 2011, 06:28 PM
saschagabor saschagabor is offline
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Question Where to buy 80 PPI reticulated foam?

As I´m in the starting stages of building WD25a (almost everything on the way or on order) I also need 12 mm thick 80 PPI reticulated foam. I have yet to find a good source for this, so I´m hoping to find some advice here.

Any info would be highly appreciated.
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Old 12th September 2011, 08:04 PM
alnewall alnewall is offline
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Default Re: Where to buy 80 PPI reticulated foam?

Have you asked World Designs if they have a piece left over?

Failing that.
http://www.ebay.co.uk/itm/Speaker-fr...item1e66e08044

Doesn't say what density it is, but might be worth asking.

Also this stuff is sometimes sold for use as fishpond filters.
I'm sure you'll find it somewhere, but a small quantity might be difficult.
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Old 12th September 2011, 08:29 PM
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john & Jake the dog john & Jake the dog is offline
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Default Re: Where to buy 80 PPI reticulated foam?

hi, how about this
http://www.wilmslow-audio.co.uk/grille-foam-356-p.asp
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Old 13th September 2011, 12:29 PM
saschagabor saschagabor is offline
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Default Re: Where to buy 80 PPI reticulated foam?

Thanks for the tips, I´ll check them out and report back.

Keep´em coming
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Old 14th September 2011, 10:28 AM
saschagabor saschagabor is offline
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Default Re: Where to buy 80 PPI reticulated foam?

Grille foam is about 30 PPI, so that won´t do any good. And from what I have found so far about pond filters, they vary between 10 and 45 PPI.

The ones I´ve found so far have been either the wrong size (too small) or the wrong PPI.

Thanks for the tips, hope you´ve got some more for me
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Old 14th September 2011, 01:05 PM
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Default Re: Where to buy 80 PPI reticulated foam?

Hi , if this foam is for grille material then I'm not sure why you want a hi PPI
Herehttp://steplaw.com/reticulatedfoam.html

If Wilmslow audio use a particular PPI then it will be fairly transparent which is what you need.
A high PPI is an absorber, are the speakers that bad that they need to absorb the waves
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Old 14th September 2011, 01:08 PM
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Default Re: Where to buy 80 PPI reticulated foam?

This is why.

"For the WD25A, however, we are leaving the grille option to the constructor and so the speaker has to look good unclothed.

Luckily modern materials can come to our rescue and we found the answer in the form of reticulated foam. This is foam sheet where the ‘bubbles’ in the foam are connected to form a latticework. Reticulated foam is typically used for water filtration – foam with larger pore sizes is used for foam loudspeaker grilles too and they are so ‘open’ that you can literally pour water straight through them.

For our resistive, aperiodic ‘port’, however, we needed a much smaller pore size with a high resistance to the large air velocity resulting from substantial cone displacements. Reticulated foam of 80 ppi (pores per inch) proved ideal and gave us the cosmetic result we were after."
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Old 14th September 2011, 01:16 PM
saschagabor saschagabor is offline
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Default Re: Where to buy 80 PPI reticulated foam?

yep
Attached Images
File Type: jpg Reticulated_foam_for_Aperiodic_Ports.jpg (56.7 KB, 37 views)
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Old 14th September 2011, 01:46 PM
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Default Re: Where to buy 80 PPI reticulated foam?

I think you'll find that this company supplied WD with the reticulated foam for the speaker ports.

http://home.btclick.com/rafseal/main.htm
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Old 14th September 2011, 01:46 PM
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Default Re: Where to buy 80 PPI reticulated foam?

Quote:
Originally Posted by pre65 View Post
This is why.

"For the WD25A, however, we are leaving the grille option to the constructor and so the speaker has to look good unclothed.

Luckily modern materials can come to our rescue and we found the answer in the form of reticulated foam. This is foam sheet where the ‘bubbles’ in the foam are connected to form a latticework. Reticulated foam is typically used for water filtration – foam with larger pore sizes is used for foam loudspeaker grilles too and they are so ‘open’ that you can literally pour water straight through them.

For our resistive, aperiodic ‘port’, however, we needed a much smaller pore size with a high resistance to the large air velocity resulting from substantial cone displacements. Reticulated foam of 80 ppi (pores per inch) proved ideal and gave us the cosmetic result we were after."
I see, If I were having bother, I'd just stick 80 drinking straws per inch up it's port.
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