Curiosity Question

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TripleM

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I've had this question for a while and never got around to asking it...

Rigid fiberglass is one of the few materials that is good at absorbing low frequency sound. But how do its properties compare to the regular old fiberglass that is used as home insulation? How similar/different are their low-frequency absorption properties?

Again, just curious.
 
mixsit said:
It's material depth where the main differences are.
Click to expand...

Yes, once you get to a foot thick, fluffy fiberglass absorbs bass frequencies pretty well. But at 2 to 6 inches the higher density of rigid fiberglass is definitely better. More here:

Density Report

--Ethan
 
Thanks guys. Interesting article. I haven't read the whole thing yet. But I looked at the graphs - which convey a lot of info.

Anyway the reason I was curious was the room I record in was, years back, a band practice room. We walled off a corner of the basement (so two sides have the foundation behind the drywall, and two sides are studs and drywall. We didn't really know what we were doing, but behind all the walls we erected, we put in two layers of 701. We put it across the ceiling too. So every square inch of the room except the floor has two layers of 701 behind it. We did it for sound"proofing" reasons, not sound quality reasons. I was just curious how well that works (I can't compare it now to the same room without the 701 obviously).
 
mixsit said:
It's material depth where the main differences are.
Click to expand...

Ethan Winer said:
once you get to a foot thick, fluffy fiberglass absorbs bass frequencies pretty well. n
Click to expand...
So, I'm assuming making superchunks for your corners takes care of that. I just made a bunch of bass traps with Roxul Superbatts. The panels are 5" thick to begin with, but in the corners I made superchunks that are about 24" wide and about 12" deep.

The only thing about fluffier fibreglass is that it's hard to work with. When I was making my chunks, once I had 6 piled up, it started collapsing. I had to hold it up while continuing to pile on.
 
RAMI said:
...The only thing about fluffier fibreglass is that it's hard to work with. When I was making my chunks, once I had 6 piled up, it started collapsing. I had to hold it up while continuing to pile on.
Click to expand...
And as it collapsed it got closer to being the dense stuff.
My first main panels efforts are the fluffy' stuffed/compacted so, not even on the chart there. :D
 
mixsit said:
And as it collapsed it got closer to being the dense stuff.
Click to expand...

Is this good or bad? Should I have built some kind of support every 4 or 5 chunks so that it doesn't compact or am I ok with letting them compress the lower ones?
 
RAMI said:
Is this good or bad? Should I have built some kind of support every 4 or 5 chunks so that it doesn't compact or am I ok with letting them compress the lower ones?
Click to expand...

Ethan Winer said:
Yes, once you get to a foot thick, fluffy fiberglass absorbs bass frequencies pretty well. But at 2 to 6 inches the higher density of rigid fiberglass is definitely better. More here:

Density Report

--Ethan
Click to expand...

Gads beats me, seems perhaps dense is better at the lower end.
Guess' we both go read the report, come back and do lunch?
:D
 
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