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jerronimo View Drop Down
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    Posted: 23 May 2015 at 6:17pm
I'm in the process of building some tops, and would like to use a grille and speaker-foam for protection, and a nice finished look.
So I bought this stuff:



This is advertised as speaker foam thickness is 10mm but seems to me that it's way to dense, i'm afraid it will block to much sound from the tweeter?
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It won't - That stuff is designed to let all freqs through fully
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Dub Specialist Sound View Drop Down
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Points: 4873 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2015 at 11:52pm
It looks like amplifier fan grill foam to me

is it the same stuff then?


Edited by Dub Specialist Sound - 23 May 2015 at 11:54pm
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jerronimo View Drop Down
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Points: 438 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jerronimo Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2015 at 9:12am
Well, I tested it on some home speakers, and it seems it does block high frequencies from the tweeter...
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AM55 View Drop Down
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Points: 1728 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AM55 Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2015 at 9:52am
Do you know how many pores per inch it is? It should have a PPI rating.

I think 35 is common and turbosound used 40 on the old TMS range. The lower the ppi the corser it will look.

Maybe PM Markie and get his opinion.
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Points: 4570 		Post Options Post Options   Thanks (0) Thanks(0)   Quote markie Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2015 at 11:30am
The one I use is HiFi35 which is 35ppi and is the industry standard. As far as I know the old Turbosound stuff was 30ppi not 40 but they fitted it in 25mm thick so 10mm shouldn't make a lot of difference.

I also sell a lot of custom made foam fronts for classic HiFi speakers and believe me when I say these guys are PICKY. I don't get any complaints about this from my customers.

Having said that I can't tell anything from the picture. It's supposed to be open cell foam and held up to the light you should be able to see through it (A bit like a "Starry starry night". If you can't then it's the wrong stuff.
If it's got wheels or tits it's gonna cost a fortune
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markie View Drop Down
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If you want to PM me your address I'll send a small sample for comparison.
If it's got wheels or tits it's gonna cost a fortune
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AM55 View Drop Down
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I stand corrected. My memory is shite.
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Mircea Bartic View Drop Down
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Inspired by your question I took some measurements a few minutes ago:

I used a OEM coaxial speaker in free air placed on the ground with the measurement mic place at 1 meter above the HF horn exit.

First I measured the speaker without foam



then I added 8mm thick foam 



The graphs look like this

Red graph = 8mm foam added
blue graph = no foam

click here for larger graph : http://i61.tinypic.com/28s4pd3.jpg



I the repeated the experiment using 2 sheets of 8mm with a total thickness of 16mm

The resulting graph looked like this:

Red graph = 16 mm foam added
black graph = no foam

click here for larger graph: http://i62.tinypic.com/289zc4h.jpg






Edited by Mircea Bartic - 24 May 2015 at 3:07pm
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all bass View Drop Down
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Points: 1855 		Post Options Post Options   Thanks (0) Thanks(0)   Quote all bass Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2015 at 6:52pm
Thanks for the fast measurements Mircea. Really helpfull!

@OP Is that speaker grill foam or some other open cell foam like as used in kitchen extraction etc?
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Mircea Bartic View Drop Down
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By the way, the foam measured was the type we use in production. Large cell open type like on the Dynacord Xa2

as you can see in the graphs , you could put over 50mm thickness before measuring any attenuation even at 20Khz
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Thanks for the Share too, very interesting not just for the OP
Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...
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