Before and after back wall treatment impulse - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 4 Old 11-07-15, 11:56 PM Thread Starter
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Before and after back wall treatment impulse

I treated my back wall with panels.... the results are in red. The orange was previous test with only a single 2x4 piece of minwool at the first reflection point at the back wall.

Can someone help me decipher this. It looks alot better but want someone elses opinion.

Microphone placed 4" above the computer chair approx 3' off the back wall.
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Before and after back wall treatment impulse-impulse.jpg  


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Last edited by Talley; 11-08-15 at 12:09 AM.
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post #2 of 4 Old 11-08-15, 07:46 AM
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Re: Before and after back wall treatment impulse

Looks to have worked very well. Comparison is a bit easier if you look at the ETC rather than the raw impulse. Also worth looking at http://www.acousticfrontiers.com/early-reflections-101/
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post #3 of 4 Old 11-08-15, 10:07 AM Thread Starter
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Re: Before and after back wall treatment impulse

Quote:
JohnM wrote: View Post
Looks to have worked very well. Comparison is a bit easier if you look at the ETC rather than the raw impulse. Also worth looking at http://www.acousticfrontiers.com/early-reflections-101/
Thank you for the link. I've read through it some. I've been reading on acoustics since I was 15 when I first bought the acoustics handbook... my problem though is alot of the techy stuff is over my head on what alot of the detailed stuff means. I definitely grasp the core though.

That article says the early reflections are the most crucial than the later which kinda reflects what my uncle has always said. My uncle leans towards the diffusion side of treatment and says the same thing that the primary reflections are the most important and has warned me to using too much absorption saying that'll create a dead space.

So far the sound has dramatically improved and I'm very excited because I still have more of the room to treat. These panels my not be attractive but my main purpose was "effective". I used the QRdude to calculate prior and design my QRD panels to use simple Furring strip materials so I can build 8' lenths at the cost of 40 bucks each. Or 3 32" pieces at around 12 dollars. According to QRdude the effective diffusion range is from 750hz to 4500hz which really shows in the RT60 which I understand many don't look at that test as a basis of audio quality but it does show some improvement in that range. Well I say improvement it reduced it down to a .3

My waterfall plot shows some heavy sounds at 70hz and also at 40 and 30 but some of this contributes to the fact I have alot of loose panels laying against the wall and such. I think it picked up some of them vibrating so I need to get the rest of the panels hung so I can retest this theory.

I'm not sure how to correct the under 50hz range considering I'd need some pretty hefty treatments and I'm thinking this would have a negative impact on the rest of the range.
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Before and after back wall treatment impulse-rt60.jpg  

Before and after back wall treatment impulse-waterplot.jpg  


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post #4 of 4 Old 11-08-15, 10:21 AM Thread Starter
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Re: Before and after back wall treatment impulse

Here is the other chart... Seems like the stronger reflection points were reduced by about 10-15db.
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