My GIK Pillar Trap Review - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 128 Old 01-28-09, 03:43 AM Thread Starter
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My GIK Pillar Trap Review

I had pretty much dismised the idea that I could sit anywhere near the front of my room. My room is under a garage and has concrete on every side with some added reinforcement of 2" thick steel on the ceiling. I had installed Helmholtz Resonators in the back of my room, some GIK 244's centered on the back wall, a drop ceiling by Ceilume with a direct mount system using back panels filled with insulation, then Quiet Batt or insulation above that. I also had each tri-corner stacked with 12" Roxul 60, a stage filled with tons of insulation, riser with lots of insulation, and four 2" panels at each of my first reflection points, with another 2X2 2" panel under my center channel. I used my equalizer to cut the peaks in my room.

I won a GIK Pillar Trap in the Shack giveaway and gave that a try in my front right corner, where I had found needed the most improvement. The bass would all the sudden get real loud from the corner and overpower the rest of the sound without the trap there. When I first placed it there I noticed that there was more life to sounds from that direction. I would measure that it was eliminating all kinds of peaks in the corner when I used REW.

I tried the trap in my left corner where I less problems feeling bass from, but instead where I heard more midbass punchiness. I decided I wanted another one there also. I won yet again another Shack giveaway and used the money to get a second GIK Pillar Trap and another pair of GIK 244's. I also received another pair of GIK 244's as a gift from my family. I used one pair of my new GIK 244's spaced away from the walls at my first reflection points, and placed the new trap in the left corner. I decided to raise it up some using some methods and am in the proccess of treating some more area under my screen. I placed my four subwoofers at each walls (pretty close to being ) midpoints per Bryan's recommendations and adjusted my seating, and the ringing is gone from when I had tried this before. REW will now recommend a filter at 25Hz but I am not hearing this problem yet and I am currently watching movies without the use of equalization. I am still trying things with the second pair of GIK 244's which I have placed over the large openings in the back of my room that are some openings into the Helmholtz Resonators in the middle of the room bellow my other GIK 244's. I have tried many things with the Helmholtz Resonators and may try filling those with insulation again.
I am still in the experemental stage, treatment stage, but the room sounds fabulous right now.

Edit: I will post some photos of the rooms progress and a couple measurements later this AM.

Last edited by thewire; 01-28-09 at 05:08 AM.
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post #2 of 128 Old 01-28-09, 07:20 AM Thread Starter
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Re: My GIK Pillar Trap Review

Here are photos of the rooms progress and a measurement of the front rows center seat with the left channel with subs, and right channel with subs. The measurement is taken as is.. I think I will trying some more concrete tiles under the sub on the stage. As it is one layer is helping for the back row, but I have some others not in use I may as well try placing under there as well. I have the needed materials to finish making the frame for the stage traps and the fabric has been ordered.

There are small holes in the corners of the room behind the carpet with the Helmholtz Resonators, and there are holes in the stage behind that opening in the center that were big enough to place my hand inside, then stuff more insulation. I can't fit anymore insulation in that stage.















Spectral decay of the left and right channel. Notice in the frequency response how close left and right match. That was my primary objective so to speak as I always had problems with this in my last HT. My other goal was tight bass to at least 25Hz and no audible distortion. My other goals are surround sound music, and video games. I have not yet gotten to the games, but the surround sound music was accomplished awhile back, and will need to check on that again.





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post #3 of 128 Old 01-28-09, 08:17 AM
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Re: My GIK Pillar Trap Review

Looking good. Glad things are working for you.

Getting the subs right makes a ton of difference.

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post #4 of 128 Old 01-28-09, 09:54 PM Thread Starter
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Re: My GIK Pillar Trap Review

Yes it does, and I now have more room to bring other seats in when we need to do so. I think I knocked loose one of the bi-wiring in my right surround inside the ceiling when I was moving materials up there. I'm having to connect that right surround to the rear right surround. The subs wiring I can run to the older wiring between the Helmholtz Resonators and move the wire from the left surround I'm using for that currently. You can see some of it there in the photo hanging out of the wall. I'm not sure it will be worth to fix the surrounds wiring since I will be moving that later anyway. I may just run one of my black wires until then, but if I am in the ceiling already, I may as well.

The 12' fabric 56" wide will be enough to cover the front area, then using some left cover the stands for the Pillar Traps that I used to elevate them. Then if I can clean things up some it will be in good shape I beleave. Firing the two subs at the left and right walls midpoints resulted in a 5dB dip at 70Hz hence they are about half a foot apart. I will let you know how it turns out, and be sure to get some better photos.
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post #5 of 128 Old 01-30-09, 06:21 PM Thread Starter
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Re: My GIK Pillar Trap Review

I am think that cutting out the front of the stage and the platforms, then placing some fabric over those as well might be benificial to the 30Hz - 40Hz, and 70Hz area. I don't see how it would hurt anything, and if the dip from 30Hz and 40Hz decay (which is a smooth dip in the response) is improved by doing so, as was adding more insulation inside the stage, I could move my front back 1', and my back row forward 1'. When I had all the subs at the walls midpoints, the ringing at 25Hz was substantially lower in my measurements, so if getting rid of some resonances means being able to do, I think it may help. I did not notice any changes when placing the GIK 244's across my front stage, which makes me curious whether the zero point energy is being directly reflected off the front of the stage in these frequencies, or it is a resonance. My modes are spaced fairly far appart there.

Here is a mode calculator example of what I am thinking may help at the front wall/floor.


Last edited by thewire; 01-30-09 at 06:42 PM.
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post #6 of 128 Old 01-31-09, 12:14 AM Thread Starter
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Re: My GIK Pillar Trap Review

I'm now in the testing phase with framing the front stage bass traps. I decided to remove the upper portion of the stage, and took a couple 2X4's flanking out the front of my wall with it. I'm will be testing with the entire thing of R19 there this time. That's cardboard at the top there that is stapled to the framing in the front.





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post #7 of 128 Old 01-31-09, 01:23 AM Thread Starter
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Re: My GIK Pillar Trap Review

Sorry I had to do these with my hush box fan running. I was able to reduce the ringing down low as I was hoping. The ringing low was removed prior to moving the subwoofer so they were firing at the same points along the walls. The mains are not calibrated as of yet, and it seems they went down in level. It might have been the small amount of insulation I removed from the corners, or I need to adjust the traps again. I doubt it was anything to do with the cable management I have been working on. I adjusted the gain a couple decibals higher. Here is a comparrison of before and after what I just did looking at the lower range. I almost gained 1Hz lower extention, and the 30Hz - 40Hz area is improved. I noticed that the other gain went up overall after moving the subwoofer, and positioning the seating effects the 50Hz - 200 Hz area gain. I saw very little change to 30Hz - 40Hz this time, but moving the seating was effecting my left right speakers response more, which I did not move.

Before



After

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post #8 of 128 Old 01-31-09, 08:19 AM
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Re: My GIK Pillar Trap Review

Nicely done. This is a perfect example of a very methodical exploration of, and finding solutions to low end issues.

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post #9 of 128 Old 01-31-09, 09:28 AM
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Re: My GIK Pillar Trap Review

And a fine example of exaclty how much bass trapping is required to tame a nasty room. Sigh... That doesn't bode well for me as I do not have the kind of room thewire does.

Nice job on the HT my friend. It has been an interesting read.
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post #10 of 128 Old 02-01-09, 09:39 PM Thread Starter
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Re: My GIK Pillar Trap Review

Quote:
fredk wrote: View Post
And a fine example of exaclty how much bass trapping is required to tame a nasty room. Sigh... That doesn't bode well for me as I do not have the kind of room thewire does.

Nice job on the HT my friend. It has been an interesting read.
Thank you. I have also measured results using one subwoofer in a much larger space in my living room. I placed a sub in at the right wall and the GIK Pillar Trap in my kitchen, and observed the best improved decay with it there having the mic near the dinning table. I concluded that would be a difficult area for me treat then. This area is meant to be a game room in the future and the kitchen is suppossed to become the snack area. I am still trying to learn in preperation for the media room project which is in the planning stages. I also hope that my room treatments will give me as good as results should I take them to another room in the future.

The 50Hz and 80Hz area is espicially difficult to treat as that would require lots of absorption on my back wall.

The only changes I have made since to the room was placing the sub under the new bass trap at the front of the room with the 2" panel behind it, and removing the stack of concrete behind it to see what difference this makes. I also removed some insulation above my projector since the tubes have been shutting on/off, and I thought it might be something to do with heat, regardless that my hush box fan is attempting to remove the hot air inside.

Last edited by thewire; 02-01-09 at 09:46 PM.
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