Bass Trap Test... did this fail? - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 15 Old 05-06-16, 07:56 PM Thread Starter
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Unhappy Bass Trap Test... did this fail?

I heard a while ago about buying insulation and leaving it in the bag to test in out.

The cheapest, easy to find rigid fiberglass in my area is Roxul R6 ComfrotBoard IS.
I got 5 boxes of the stuff and did some tests.



Did this fail as a test or is this stuff too rigid.
Boxes have 6 panel at 1.5 Inches so 48' x 24' x 9'

First SPL graph Blue is before Yellow is after.
Decay graph first before second after... same with Waterfall graph.
Attached Thumbnails
Bass Trap Test... did this fail?-imag0891.jpg  

Bass Trap Test... did this fail?-imag0889.jpg  

Bass Trap Test... did this fail?-spl.jpg  

Bass Trap Test... did this fail?-decay-no-traps.jpg  

Bass Trap Test... did this fail?-decay-all-traps.jpg  

Bass Trap Test... did this fail?-waterfall-no-traps.jpg  

Bass Trap Test... did this fail?-waterfall-all-traps.jpg  


Last edited by Blacklightning; 05-07-16 at 11:00 AM.
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post #2 of 15 Old 05-06-16, 08:03 PM
 
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Re: Bass Trap Test... did this fail?

Do you have before and after tests... I am assuming the ones you posted are after. Or is this before and after?

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post #3 of 15 Old 05-06-16, 09:56 PM Thread Starter
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Re: Bass Trap Test... did this fail?

Quote:
ellisr63 wrote: View Post
Do you have before and after tests... I am assuming the ones you posted are after. Or is this before and after?
I will add labels, but yes they are before and after.

Last edited by Blacklightning; 05-07-16 at 11:20 AM.
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post #4 of 15 Old 05-07-16, 09:10 AM
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post #5 of 15 Old 05-07-16, 03:14 PM
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Re: Bass Trap Test... did this fail?


The “after” graphs shows overall less ringing between 60-190 Hz. Whether or not it’s enough to make an audible difference, you’ll have to be the judge of that.

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post #6 of 15 Old 05-08-16, 12:43 AM
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Re: Bass Trap Test... did this fail?

You have to remove the plastic and put a cloth miss the air so that the traps are more or less effective.
You can line them wadding and then an acoustic fabric to your personal taste.




I apologize for my English,translator use.

Greetings.

Last edited by hemiutut; 05-08-16 at 12:51 AM.
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post #7 of 15 Old 05-08-16, 12:13 PM
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Re: Bass Trap Test... did this fail?

The frequency response is showing that though you treated the space, you didn't evidently get it in the right place for the big null and likely it wasn't thick enough to get that low in frequency.

I am serious... and don't call me Shirley.

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post #8 of 15 Old 05-08-16, 12:21 PM Thread Starter
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Re: Bass Trap Test... did this fail?

Quote:
hemiutut wrote: View Post
You have to remove the plastic and put a cloth miss the air so that the traps are more or less effective.
You can line them wadding and then an acoustic fabric to your personal taste.

I apologize for my English,translator use.

Greetings.
I did not remove the plastic because I'm going to be returning the stuff. Plus I figured bass would just travel through thin plastic.

This was just a test to see if I'm going to spend real money on bass traps.
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post #9 of 15 Old 05-08-16, 12:31 PM
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Re: Bass Trap Test... did this fail?

The plastic is fine on. When you have a layer like that it only restricts high frequencies. It acts somewhat like a membrane for the mids and lows. Where it stops absorbing depends on the density of the plastic.

I am serious... and don't call me Shirley.

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post #10 of 15 Old 05-08-16, 01:52 PM Thread Starter
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Re: Bass Trap Test... did this fail?

Quote:
bpape wrote: View Post
The plastic is fine on. When you have a layer like that it only restricts high frequencies. It acts somewhat like a membrane for the mids and lows. Where it stops absorbing depends on the density of the plastic.
Thanks for all the help guys. I think the combination of my small room and Sound proofing has created a few peaks and nulls that can not be handled easily. I'm not really willing to pay the money needed for 4(or more) membrane tuned bass traps. I was hoping 9" thick ridged fiberglass panels with a 12" plus air gap would help below 100Hz in my room. My next test will be a multi "sub" test.
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