Asymmetric Room Treatment Advice

jens
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Posts: 2

Asymmetric Room Treatment Advice Mar 23, 2017 20:45:24 GMT

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Post by jens on Mar 23, 2017 20:45:24 GMT

I've read through the Acoustics FAQ but couldn't find too much information on asymmetric rooms so I'd very much appreciate some advice related to my particular room.

I'm currently building a home theater on the 2nd story of my house. The theater has 8ft ceilings with a 7" plywood/MDF soffit surrounding the room perimeter. Over the theater is the attic that has about 2ft of blown-in insulation. Below the theater is the garage with about 1 to 2ft of insulation between garage and theater.

The attached drawing shows nine windows, eight of which will be plugged by 4" of OC703 and 3/4" plywood over the top of that and another 1" of OC703 covering the plywood. The window in the closet will not be plugged. The closet walls are made of 2 by 6's and insulated with pink fiberglass. The closet will contain all the audio equipment.

The drawing shows a 7.2.4 speaker arrangement made up of volt 10LX's for the surrounds/atmos, Titan 615LX's for LCR, and two HST18 subwoofers behind the couch.

My plan for acoustic treatments is as follows:

3/4" MDF wainscoting along the room perimeter at a height of 24".

2" of OC703 on the front wall with 4" of OC703 in the two front corners at a 45 degree angle from floor to ceiling.

1" of OC703 along the side walls.

2" of OC703 along the back wall.

Soffit will be stuffed with pink fiberglass insulation.

The columns housing the surround speakers will be insulated with 1" OC703.

The ceiling portion without a soffit will be painted by night sky murals so no insulation will be applied.

All walls will be covered by GOM fabric and the floor is carpeted.

I'm sure there's plenty of OC703/705 FSK I should be adding but this is where I need additional advice. Any advice will be greatly appreciated and will be followed as best as I can.

Ethan Winer
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Posts: 791

Asymmetric Room Treatment Advice Mar 27, 2017 15:05:02 GMT Hexspa likes this

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Post by Ethan Winer on Mar 27, 2017 15:05:02 GMT

I'd reverse the window plugs and have 1-inch 703 inside the cavity, with four (or at least two) inches on the room side of the plywood.

I'd use 2-inch thick 703 instead of only one inch in all the places you mentioned one inch thick. One inch is okay if it's spaced off the wall an inch or two. But the effort and cost of lath spacers may exceed the cost difference to just get 2-inch 703.

Likewise for the rear wall, which creates the most damaging reflections down into the bass range. As a reference, the large professional control room in a million dollar recording studio often has three foot thick insulation in front of the rear wall. You don't need to do all that! But 4 inch thick 703 spaced off the wall 4-8 inches is vastly better than the two inches thick you propose.

Aren't the left and right surrounds too far forward? They seem slightly forward of the couch, when they should be slightly behind it.

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The Acoustic Treatment Experts

jens New Member Posts: 2	Asymmetric Room Treatment Advice Mar 28, 2017 15:11:23 GMT via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jens on Mar 28, 2017 15:11:23 GMT Thank you for your reply. The drawing was created before i decided to plug the windows, so now the side speakers are further back. So you don't think I need to use OC705 anywhere, just OC703?

Hexspa
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Asymmetric Room Treatment Advice Mar 28, 2017 23:09:10 GMT

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Post by Hexspa on Mar 28, 2017 23:09:10 GMT

Mar 28, 2017 15:11:23 GMT jens said:

Thank you for your reply. The drawing was created before i decided to plug the windows, so now the side speakers are further back.

So you don't think I need to use OC705 anywhere, just OC703?

It comes down to cost. 705 is always better than 703.

-m

Words and music.

Ethan Winer Administrator Posts: 791	Asymmetric Room Treatment Advice Apr 4, 2017 21:18:48 GMT Hexspa likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Ethan Winer on Apr 4, 2017 21:18:48 GMT Just to clarify, 703 is better than 705 for reflection panels because it has a softer surface that absorbs better for sound arriving at an angle.
	Ethan's Audio Book The Acoustic Treatment Experts

Asymmetric Room Treatment Advice

Post by jens on Mar 23, 2017 20:45:24 GMT

Post by Ethan Winer on Mar 27, 2017 15:05:02 GMT

Post by jens on Mar 28, 2017 15:11:23 GMT

Post by Hexspa on Mar 28, 2017 23:09:10 GMT

Post by Ethan Winer on Apr 4, 2017 21:18:48 GMT