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Post by Reza E on Jan 23, 2017 21:56:31 GMT
Hi Ethan,
First I wanna thank you for your great contribution to the sound community. I have read many of your teachings and comments on the web. There is one thread that I have not been able to find much info about. Bass traps for corners, with air or full insulation backing?
There is lots of design using 2 to 4 inch Corning or Roxul with triangular space behind. How about filling the triangle with the same material without any air gap similar to what Auralex does. Doesn’t more mass of the insulation slow the bass frequencies more than the air gap?
Thank you ahead of time.
Reza
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Post by Ethan Winer on Jan 23, 2017 22:38:34 GMT
I never measured the difference between a 4-inch thick panel straddling a corner, versus the same panel with the air space filled. I've guessed that filling will increase absorption about 25 percent, but that requires twice as much material. So if cost is no object, sure, fill the air space. Otherwise, the same number of dollars will go much farther by having additional bass traps that go in other locations, such as wall-ceiling or even wall-floor corners.
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Post by Reza E on Jan 24, 2017 23:12:44 GMT
Thank you for your quick response. Last question if you don't mind. Would triangle cut wedges with material like Roxul do better than foam bass traps since they are denser?
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Post by rock on Jan 25, 2017 13:21:05 GMT
Many of the forum members have made "Super Chunks" like you're describing. For best LF performance, I believe you still need paper or plastic spray glued to the front facing the room.
If it's a permanent installation, you can stack them up, attach furring strips right to the wall and ceiling adjacent to the Roxul and and then stretch and staple fabric. For a clean finish, cover the stapled edges with thin wood trim.
Cheers, Rock
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Post by Ethan Winer on Jan 25, 2017 18:56:11 GMT
Good quality genuine acoustic foam absorbs similarly to low density rigid fiberglass. The main problem with most foam products is they're too small or too thin. Good foam also costs more than fiberglass type rigid insulation. So if you're making your own corner bass traps that are covered with fabric, it makes no sense to buy foam.
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Post by Hexspa on Jan 27, 2017 3:32:52 GMT
2" will help a tad with early reflections but, again, 4" or thicker is better in most applications.
-m
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