sorry. In this corner of the world, it is called rubber cement. It's cement combined with rubberized component in it. It's a flexible layer of cement. I like it because it glues not just to concrete, but a lot of other material.
I also used it to damp metal roofing. Without it, rain makes quite a concert, but with a layer on it, it quiets it down quite a bit.
Fair enough perceval but since I have to identify these things making my living, I want to suggest the product shown is not a cement, it is a coating. They are very different, no matter what corner of this spherical rock you are on.
Now, we might be wandering away from the intent of this thread so unless we have more to add, I am happy to leave the thoughts there.
Now, we might be wandering away from the intent of this thread so unless we have more to add, I am happy to leave the thoughts there.
another alternative, North Creek Glop
"I followed North Creek's suggestion to "glop" the sides of the cabinet. Glop is a 50/50 mixture of their soft glue and drywall compound; Short claims that this helps dampen the cabinets above 300 Hz (seen here on the outside walls of the cabinets as a 1/8 to 1/4" thick layer).
"
from
http://radio-weblogs.com/0101702/categories/myHobbies/JordanSpeakers.html
North Creek Cabinet Handbook
https://www.diyaudio.com/community/attachments/cabinet-handbook-pdf.787055/
old North Creek
https://web.archive.org/web/20190129111921/http://www.northcreekmusic.com/index.html
(I've used white Weld Bond glue & drywall compound)
"I followed North Creek's suggestion to "glop" the sides of the cabinet. Glop is a 50/50 mixture of their soft glue and drywall compound; Short claims that this helps dampen the cabinets above 300 Hz (seen here on the outside walls of the cabinets as a 1/8 to 1/4" thick layer).
"
from
http://radio-weblogs.com/0101702/categories/myHobbies/JordanSpeakers.html
North Creek Cabinet Handbook
https://www.diyaudio.com/community/attachments/cabinet-handbook-pdf.787055/
old North Creek
https://web.archive.org/web/20190129111921/http://www.northcreekmusic.com/index.html
(I've used white Weld Bond glue & drywall compound)
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Has anybody tried making foams (e.g. silicone foams like this) with a graded acoustic impedance (e.g. by increasing pore size and/or pore density towards the air facing surface)? Something like that might actually work well as a sound absorber, not just as a panel vibration damp(en)er.
Settling of a foam under gravity while curing might induce a gradient naturally.
Settling of a foam under gravity while curing might induce a gradient naturally.
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