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fivepoundmusic
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#1
21st December 2008
Old 21st December 2008
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Another corner trap question

Hello!

i´m about to treat my room and have a question regarding the corner traps.

I have some panels of very dense material, 4" thick.
Would it be bad to make corner chunks with this very absorbent kind of stuff or would it be better if I just put a 4" panel in the corners?
Perhaps i should fill out the gap behind with fluffy glasswool?


Thanks.
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21st December 2008
Old 21st December 2008
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Do you know what kind of materiel it is and the density?

If between 3 pound and 8 pound (maybe even 10 pound) filling the corner will always absorb more of the lower frequencies. But keep in mind that coverage is most important, so if you don't have all that much materiel go with 4" panels and straddle the corners. And yes you can always fill behind the panels with fluffy fiberglass.
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Built in Slat design (Scattering/Diffusion) on all Bass Traps click here
fivepoundmusic
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21st December 2008
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Thank you, Glenn.

It is some kind of cellulose called Homatherm FlexCL.
The Airflow resistivity is 43-76 kPs/qm, the density is 70 kg/m3.
Absorption coefficients for the 50mm panels (with no air gap):
125 Hz: 0,2
250 Hz: 0,8
500 Hz: 1,0
1000 Hz: 1,0
2000 Hz: 1,0
4000 Hz: 1,0

30mm, no air gap:
125 Hz: 0,1
250 Hz: 0,35
500 Hz: 0,85
1000 Hz: 1,0
2000 Hz: 1,0
4000 Hz: 0,95

Would it be better to fill out the whole corner with that stuff?
And how would you treat the ER points? With the thicker or thinner panels?

I have six panels of 100mm and ten of 60mm at the moment. I can get 40mm and 120mm also.

Thank you

Oliver
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6th January 2009
Old 6th January 2009
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who else is using flexCL and has anyone measurement comparisons with 703 at hand?
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7th January 2009
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Quote:
Originally Posted by okailla View Post
Thank you, Glenn.

It is some kind of cellulose called Homatherm FlexCL.
The Airflow resistivity is 43-76 kPs/qm, the density is 70 kg/m3.
Absorption coefficients for the 50mm panels (with no air gap):
125 Hz: 0,2
250 Hz: 0,8
500 Hz: 1,0
1000 Hz: 1,0
2000 Hz: 1,0
4000 Hz: 1,0

30mm, no air gap:
125 Hz: 0,1
250 Hz: 0,35
500 Hz: 0,85
1000 Hz: 1,0
2000 Hz: 1,0
4000 Hz: 0,95

Would it be better to fill out the whole corner with that stuff?
And how would you treat the ER points? With the thicker or thinner panels?

I have six panels of 100mm and ten of 60mm at the moment. I can get 40mm and 120mm also.

Thank you

Oliver
70KG/M3 is just fine...it's a good bit denser than 703, but that's okay. It'll work well for the corners.

I like to treat reflection points with 4" panels personally, but 2" panels will do.

Frank
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7th January 2009
Old 7th January 2009
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Thanks for the reply, Frank.
Some people told me that this stuff is too dense and acts reflective and it will not help bass absorption at all.

@_rd: Take a look at this thread. It convinced me to try that stuff! The whole CR is stuffed with that shit and somewhere at page 5 i think they talk about the acoustical properties.


Amsterdam Mastering - construction thread

I can send you a pdf whith measurements.


Oliver

Last edited by fivepoundmusic; 7th January 2009 at 06:42 PM.. Reason: Just realized _rd is from Germany :)
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7th January 2009
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Quote:
Originally Posted by okailla View Post
Thanks for the reply, Frank.
Some people told me that this stuff is too dense and acts reflective and it will not help bass absorption at all.

@_rd: Take a look at this thread. It convinced me to try that stuff! The whole CR is stuffed with that shit and somewhere at page 5 i think they talk about the acoustical properties.


Amsterdam Mastering - construction thread

I can send you a pdf whith measurements.


Oliver
I wouldn't use it for early reflection points...it is too dense for that application, but it's great for 4" bass traps or superchunk stuff.

Frank
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7th January 2009
Old 7th January 2009
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Bit of Both

I have been intrigued by that Homatherm stuff. It is warmly spoken of in that Amsterdam thread, but I note plenty of Rockwool in the photos also. Furthermore the health issues are not at all what you might assume. I would make sure those fibres are well contained.
Like others here I am sure it would work well as a SuperChunk. However it has been suggested elsewhere that lighter materials do a better job when the corner is completely filled. 703 or equivalent (48Kg) is often used. A floor to ceiling stack can be heavy and compress itself. Why not hedge your bets? If it is stiff enough I suggest you straddle the corners with it and fill the gap behind with lighter insulation, e.g. the attic stuff.
Here's a design which takes care of all sorts of constructional problems really simply and cleverly.
Corner Traps finally finished! - Home Theater Systems - Electronics and Forum - HomeTheaterShack
Best Regards, Dan FitzGerald
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7th January 2009
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Thanks for your help, gentlemen.


Would it help bass absorption if I made the panels thicker or is it counterproductive??
I´ve already built some 6" panels.

What if I put some fluffy fibre glass or foam in front it to absorb the highs and mids?

Oliver
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8th January 2009
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Another question:

How come that the absorption coefficient is 1 for mids but it is too dense for mid absorption??
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8th January 2009
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Don't Sweat it

Thick is good for Bass. These slightly denser panels may be slightly less efficient at MF HF. It's relative, they are still absorbing a lot. Some people put HF reflective foils or wood struts across the front of these corner traps, so you might have a happy accident! Go with the 6 inchers. It will work remarkably well.
DD
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