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Panel Absorber

70.104.10.247
Posted on October 5, 2009 at 19:03:06
Toology86@yahoo.com
Audiophile

Posts: 25
Location: CA
Joined: November 28, 2007
 Hi , i have been working on a plan ( huge help from the master handbook of acoustics ) to build 2 panel absorbers ( membrane based bass traps ) tuned to 50hz in my front corners behind the speakers. I already own quite a few Real traps mondo traps placed in 10 of my 12 corners and only have a problem left at 50 hertz. I only have a few small questions. 1 , is there any benefit to using 705 instead of using 703 behind the plywood and 2, is more then 1 or 1 and a half inches to use behind the plywood? like using the whole 2 inch panel. I know to seal it air tight and space the fiberglass around a quarter of a inch away from the plywood , im just curious if i have to use lower density fiberglass like 703 stated in the book. Thanks again.

RE: Panel Absorber, posted on October 6, 2009 at 13:17:42
Ethan Winer
Manufacturer

Posts: 1554
Location: New Milford, CT USA
Joined: December 3, 2003
 You'll probably be successful making wood panel traps to target 50 Hz. The issue is if two will be enough. As you know, with bass traps, surface area is everything.

One solution is to build panel traps flat onto the front and rear walls, then put your MondoTraps in front (but not touching the wood). That way you can cover much more total surface, and have the best of both trap types. Really low frequencies that get through the MondoTraps will then be absorbed by the panel traps.

--Ethan

RE: Panel Absorber, posted on October 6, 2009 at 13:56:12
Toology86@yahoo.com
Audiophile

Posts: 25
Location: CA
Joined: November 28, 2007
 Thats a great idea ethan , thats what i will do . Should i stick though with 2" 705 or should i use the 1 or 1 and a half inch 703 the handbook uses? thanks again.


Chris

RE: Panel Absorber, posted on October 7, 2009 at 09:51:35
Ethan Winer
Manufacturer

Posts: 1554
Location: New Milford, CT USA
Joined: December 3, 2003
 The thicker the better. For bass frequencies I suggest 705 that's at least three inches thick, and thicker is only better. Wood panel traps target a range only an octave wide at best, so you still need plenty of thickness to handle the higher bass range.

--Ethan

RE: Panel Absorber, posted on October 6, 2009 at 00:01:41
David Aiken
Audiophile

Posts: 5109
Location: Brisbane
Joined: September 25, 1999
 Why not use some more MondoTraps or one of the new corner traps from RealTraps, or some other broad band trap?

I know you say that there is only a problem at 5o Hz and I'm even prepared to believe you, but more broad band trapping will help with that problem AND that 50 Hz frequency will change if you ever shift to another room so narrow band traps tuned to 50 Hz will not be useful if you move and additional broad band traps will work in any room.


David Aiken
RE: Panel Absorber, posted on October 6, 2009 at 00:19:57
Toology86@yahoo.com
Audiophile

Posts: 25
Location: CA
Joined: November 28, 2007
 i actually tried some broadband absorption in the corner but it didnt address the issue that much. I have a +/- 1.2 db response from 18hz to 300hz except at 50 hz , i have a nasty 9db suckout. I tried speaker movement and listening position , but nothing works. I measured the decay timing of the room with ETF and its good , so i figure this is the only other route , other than the Helmholtz route. I own the home to and dont plan on moving for a long time , thanks for the concern though , its great to see people still care . Thanks.

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