Pink Fluffy Corner Traps Question - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 8 Old 09-20-13, 08:30 AM Thread Starter
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Pink Fluffy Corner Traps Question

I tried my hand at some corner traps, white fluffy actually.

I am curious, how tight do you stuff them. I tried to leave them in a natural state of R19. Should they be compressed a bit?

Here are a couple of photos. The first, adding the insulation and shelving to to keep the insulation from collapsing over time.

I used snow fensing to hold the insulation in place and hopfully reflect back some of the high frequencies.

The last is two traps in place with a GIK in front. The GIK is awesome and I plan to order another pair for a couple other corners but I needed a lot of size for this corner.
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post #2 of 8 Old 09-20-13, 08:54 AM
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Re: Pink Fluffy Corner Traps Question

With that kind of size/depth, the natural state to a bit compressed would be about right. Don't want to cram it too tight. MOST dense I would go would be 3lb/cu ft which is about 4x what the fluffy state is.

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post #3 of 8 Old 09-21-13, 09:11 AM Thread Starter
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Re: Pink Fluffy Corner Traps Question

Thanks for the response Bryan. They are probably closer to half a pound per foot.
Would I be better getting it over one pound?

By my calculations my top section is just over 10 cubic feet (4.6'x2'x2.25' / 2) and I doubt there is more than five pounds in its natural form.
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post #4 of 8 Old 09-21-13, 09:19 AM
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Re: Pink Fluffy Corner Traps Question

well, 10 cu ft would be basically an entire roll of batts by weight. Not sure you need to go that far to do the 3lb.

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post #5 of 8 Old 09-21-13, 07:11 PM Thread Starter
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Re: Pink Fluffy Corner Traps Question

That was a relief. Weighed the larger trap and it had about 9 pounds in it and I was was not getting the affect I was looking for. Doubled it up to 18 pounds and added three more pounds to the lower (smaller) trap.
I didn't even have to take a measurement to know that it made a huge improvement.

Here are the waterfalls first at 9 pounds. Second at 18 pounds.
I am running all analog with one band of PEQ at 36hz taking of -12dB +/-3Hz.

Notice the reduced ringing at 25hz, and others. Plus filled in some of my 70-90hz suck out. I have a phase issue there that I don't know what to do with yet. It's coming from my mains and looks worse without the subwoofer.
Finally, a shot of the unsmoothed response showing my phase problem.
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post #6 of 8 Old 09-22-13, 09:14 AM
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Re: Pink Fluffy Corner Traps Question

Check the center of the wall behind you as a possible place for that dip/phase issue.

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post #7 of 8 Old 09-23-13, 07:39 AM Thread Starter
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Re: Pink Fluffy Corner Traps Question

Thanks Bryan,
I do have two 2'X4'X4" 705 panels back there. They are on the floor but reach half way up the wall. I will double check it.
By the way, all of my 705 is slowly being changed out for something less dense.

I have an issue right about that frequency range in the middle of the front wall at the ceiling. I have a makeshift helmholz tube near it with some fiberglass to increase the Q but it is not helping. The helmhotz is just too narrow. I was thinking of putting a GIK Soffit trap up there when funds become available.
Hopefully that will fix it.
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post #8 of 8 Old 09-23-13, 09:56 AM
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Re: Pink Fluffy Corner Traps Question

705 for 4" is fine - just more expensive than it needs to be. 4" is not going to get down to 70Hz though when flat on a wall. Even 6" you're pushing without a bit of air gap behind it.

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