IB installation question on wall bracing - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 16 Old 11-13-16, 05:45 PM
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Re: IB installation question on wall bracing

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ZX-Tex wrote: View Post
Thanks for the feedback. Your description on your setup and your results is good information. I know it is a bit silly, but since those 15" UMs while on sale are only $10 more (each) than the 12" UMs, I had to get them.
Well, having more than you need is easier to deal with than having less than you need... you can run amps at 60%, but not 140%.

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ZX-Tex wrote: View Post
I can actually get into and move around a bit in that space in the wall, so I am able to add bracing and the like. It is difficult to get a good picture of what I have done so far without a fisheye lens. Panoramas did not work well either. At any rate, I have already added some more rigidity to the drywall and the wall structure. I used construction adhesive to glue the drywall to the wall studs to augment the drywall fasteners. That made a noticeable difference. So did the horizontal bracing between the studs in the second picture; imagine that image is actually rotated 90 degs clockwise.
Good move, gluing the drywall to the bracing. That will take out a lot of flex and rattle. It to me a few minutes of bouncing back and forth between pictures, reading the description, and turning my head sideways to figure out what that shot was... but I got there.

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ZX-Tex wrote: View Post
I've removed the low-frequency ring from the 4x5 foot wall by tying it back to the exterior wall with some very stiff bracing. I can add some additional damping to the drywall if I have issues at higher SPLs. I plan to make the manifold removable just in case I need to crawl back in there to beef things up.

Definitely a good call. Making it a permanent install could get you into a heap of trouble down the road.

Have fun, and post more pics!
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post #12 of 16 Old 11-14-16, 02:39 PM Thread Starter
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Re: IB installation question on wall bracing

Here are some more pictures, specifically a couple of panorama shots.

If you stuck your head through the manifold opening, laid down on your back, and looked straight up, this is what the walls/enclosure would look like. The inside of the large wall (where the manifold hole is at) is on the bottom, and is now covered with 5/8" sheetrock glued to the wall studs with construction adhesive. This will provide some more isolation.

The two exterior walls are at the top and the right side. The left side is the small interior wall. The two boards running from top to bottom are the 2x4 braces that tie the exterior and interior walls together. In the center of the photo, covered with insulation, is the underside of the roof.

The axes of the two speakers will be aligned left to right, opposed to each other and firing into the center of the manifold.



The image below is in the same orientation and shows the insulation battens that I added at the top of the enclosure. It's standard wall insulation, laid sideways on top of the two brace boards. This should deaden standing waves, and increase the effective size of the enclosure a bit. The interior of the volume is pretty dead acoustically.


Last edited by ZX-Tex; 11-14-16 at 03:13 PM.
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post #13 of 16 Old 11-14-16, 06:58 PM
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Re: IB installation question on wall bracing

Looks pretty good so far... how long until you've got your manifold installed?
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post #14 of 16 Old 11-14-16, 07:40 PM Thread Starter
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Re: IB installation question on wall bracing

I'm working on it now. The manifold and the speakers should be in by this weekend.

Getting it all tuned in for the room will take longer of course, but I can make an initial assessment.

Last edited by ZX-Tex; 11-14-16 at 08:09 PM.
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post #15 of 16 Old 11-19-16, 09:01 PM Thread Starter
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Re: IB installation question on wall bracing

Manifold in place



I have been testing it this afternoon with a variety of sources. Here is what I have so far:
1. The wall is sufficiently braced. It is not moving, or at least not any more than any of the other walls in the room.
2. Low frequency SPL is high for only running off of one channel of a Behringer Inuke1000 at 2 Ohms (non-bridged) though it is close to the peak of its output. Once I install the other two UM15-22 in the opposite wall, and run the additional amp channel, it should be more than enough.
3. There are some room modes as expected that are adding some peaks to the response. The next step will be to use REW and a Behringer FD to tame the room responses with some EQ. I would not call the response musical quite yet, but I can hear that the potential is there.
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post #16 of 16 Old 11-19-16, 09:10 PM
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Re: IB installation question on wall bracing

Yeah, room modes are going to end up being the biggest issue. Looks like a great setup... nicely done!
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