Speaker front foam
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URL: https://forum.speakerplans.com/forum_posts.asp?TID=92111
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Topic: Speaker front foam
Posted By: jerronimo
Subject: Speaker front foam
Date Posted: 23 May 2015 at 6:17pm
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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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Replies:
Posted By: Hemisphere
Date Posted: 23 May 2015 at 6:33pm
| It won't - That stuff is designed to let all freqs through fully |
Posted By: Dub Specialist Sound
Date Posted: 23 May 2015 at 11:52pm
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It looks like amplifier fan grill foam to me is it the same stuff then?
------------- 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... |
Posted By: jerronimo
Date 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... |
Posted By: AM55
Date Posted: 24 May 2015 at 9:52am
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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. |
Posted By: markie
Date Posted: 24 May 2015 at 11:30am
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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 |
Posted By: markie
Date Posted: 24 May 2015 at 11:30am
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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 |
Posted By: AM55
Date Posted: 24 May 2015 at 11:43am
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I stand corrected. My memory is shite. |
Posted By: Mircea Bartic
Date Posted: 24 May 2015 at 2:44pm
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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" rel="nofollow - 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" rel="nofollow - http://i62.tinypic.com/289zc4h.jpg  ------------- general manager & head designer at nexus-acoustics research http://www.facebook.com/nexus.acoustics.research" rel="nofollow - http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
Posted By: all bass
Date Posted: 24 May 2015 at 6:52pm
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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? ------------- https://www.instagram.com/my_modular_journey/ |
Posted By: Mircea Bartic
Date Posted: 24 May 2015 at 7:15pm
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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 ------------- general manager & head designer at nexus-acoustics research http://www.facebook.com/nexus.acoustics.research" rel="nofollow - http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
Posted By: Dub Specialist Sound
Date Posted: 24 May 2015 at 7:32pm
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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... |
Posted By: jerronimo
Date Posted: 25 May 2015 at 12:41pm
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Thanks for all the useful info!!! I investigated a little further, this: http://www.casebuilder.com/flightcase-onderdelen/zachtschuim/zachtschuim-10mm/54/88" rel="nofollow - http://www.casebuilder.com/flightcase-onderdelen/zachtschuim/zachtschuim-10mm/54/88 is the foam I got. I think it´s the penn elcom M6010 Plastazote foam, but not really sure. U can only barely see thru it when hold directly into the sun. Penn elcom also has the M6606 filter foam which is 6mm and has 30 holes per square inch. This is the one I should get I think. Markie are u able to ship to The Netherlands?
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Posted By: snowflake
Date Posted: 25 May 2015 at 1:57pm
| what you have got there is closed cell foam. try blowing through it |
Posted By: markie
Date Posted: 25 May 2015 at 3:10pm
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I'll PM you. ------------- If it's got wheels or tits it's gonna cost a fortune |