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Post by cferrari on May 16, 2016 19:36:39 GMT
Hi,
I'm starting to build some broadband abosrbers and membrane absorbers, both with rockwool insulation (64Kgs/M3 density) but I can't decide wich material I use for the frames, Pine Wood or MDF? (both are 1'' wide)
Wich one is usually used?
For the membrane absorbers I would use a thin MDF membrane (9mm).
My question is: is there a problem if my membrane absorbers has a thicker frame (1'' MDF of pine)? Would that interfer on the membrane vibration?
Thank You
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Post by Rock on May 17, 2016 5:51:11 GMT
The frame is not intended to resonate so it is not a factor in determining the resonant Freq, so the frame material is not critical as long as it's solid. Did you consider using broadband absorbers only? They are recommended for smaller rooms over resonant panel absorbers.
Cheers,
Rock
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Post by Ethan Winer on May 17, 2016 16:51:23 GMT
Rock gave you the right answer. For simple frames, the only goal is to hold the rigid fiberglass in position. But I have to question your intention to build wood panel traps, if I read your post correctly. Most smaller rooms do better with thick material for broadband absorption. If you want to target very low frequencies, use even thicker material and have more traps.
--Ethan
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Post by cferrari on May 19, 2016 1:50:41 GMT
The frame is not intended to resonate so it is not a factor in determining the resonant Freq, so the frame material is not critical as long as it's solid. Did you consider using broadband absorbers only? They are recommended for smaller rooms over resonant panel absorbers. Cheers, Rock Yes I'm considering it, Rock. First I'm going to build only the broadband absorbers and if my problem continues I'll try some different approach. Thank you for your advice  my question was about the actual frames (if the material would interfer that much). About the membranes I mentioned, actually my plan is to do a helmholtz resonator made with 9mm MDF and calculate the amount of holes. Today I just built the 4 frames from the broadband absorbers can't wait to measure the difference, I'm waiting for the rockwool Thank you |
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Post by Hexspa on May 19, 2016 5:08:01 GMT
pics
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