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Old 14th September 2011, 12:08 PM
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pre65 pre65 is offline
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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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