Acoustical Treatments Master Thread - Page 397 - AVS Forum | Home Theater Discussions And Reviews
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post #11881 of 11890 Old 06-03-2017, 05:08 PM
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Originally Posted by kgveteran View Post
There are some among us who feel first reflection panels are 100% wrong, i believe they are very benificial.
Those people just have no idea how room treatment works or the point of first reflection points.

There is a reason recording studios and best home theaters use them.....no wonder they sound much better than your "average joe's" room!

Theater: Sony 45es, 120 inch 16:9 screen, Panny BDT500, Rotel RMB-1075, Rotel RSP-1068, Klipsch RP-280F, RP-450C, RP-160M, SVS PB13 x 2, Monster Power Conditioner, GIK acoustic panels

TV Room: Panasonic 60" plasma, Integra DTR-30.3, Axiom Audio M60, VP150, QS8, EP500
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post #11882 of 11890 Old 06-10-2017, 08:43 AM
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Originally Posted by ereed View Post
Those people just have no idea how room treatment works or the point of first reflection points.
Yeah, you're totally right, of course. People like Floyd Toole haven't got a clue.
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post #11883 of 11890 Old 06-11-2017, 02:43 AM
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Originally Posted by kgveteran View Post
There are some among us who feel first reflection panels are 100% wrong, i believe they are very benificial.
Do you believe that the correct approach is to always treat first reflection points with thick absorbing panels?

I don't think anyone is saying that it is 100% wrong to treat first reflections... But some people are saying, that it all depends on the speakers and the distances between speaker, wall and listener. And this is, in my mind, a 100% correct approach.

EDIT: And the question is not only "to treat it or not" but HOW to treat it. Absorbtion, reflection and diffusion are the tools (or a mixture).
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Last edited by JonasHansen; 06-11-2017 at 03:24 AM.
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post #11884 of 11890 Old 06-13-2017, 05:55 AM
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Confussed

I have scanned most of the post regarding front wall acoustic and not sure what is the latest thoughts. My room is about 20 by 14. I plan to build a screen false wall about 2 feet from the front wall. The front wall is an outside wall sheet rock with R13 insulation between the outside wall. I am on a slab with carpet. What do I put on the front wall and the side walls behind the screen?
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post #11885 of 11890 Old 06-13-2017, 09:27 AM
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What do I put on the front wall and the side walls behind the screen?
Your room is very similar to mine, and I would suggest that you do the same thing that I did: line all those surfaces with two layers of duct liner, separated by a layer of heavy plastic (I used 6 mil). This seems to be the standard, when a baffle wall is not used.
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post #11886 of 11890 Old 06-14-2017, 04:22 PM
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Your room is very similar to mine, and I would suggest that you do the same thing that I did: line all those surfaces with two layers of duct liner, separated by a layer of heavy plastic (I used 6 mil). This seems to be the standard, when a baffle wall is not used.

is this acceptable rather than duct liner which i don't seam to be able to find.

Expanded Polystyrene Foam Board Insulation
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post #11887 of 11890 Old 06-14-2017, 08:18 PM
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Originally Posted by FrankTR View Post
is this acceptable rather than duct liner which i don't seam to be able to find.

Expanded Polystyrene Foam Board Insulation
I'm afraid not. Expanded polystyrene is a closed-cell foam. Open-cell foam gets you into the right realm of materials, but in most cases a fiber is better. The material must have open but convoluted pathways for air to move through. It's the partial restriction of air movement that diminishes the sound wave propagation and ultimately the pressure level.

Something simple like cotton batting would be somewhat effective, but you need to be careful about flammability. Somewhere near you is an insulation distributor who will sell to the public. A roll of duct liner is pretty pricey, but very useful. Sometimes leftovers come up for sale in the classified section here.
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post #11888 of 11890 Old 06-15-2017, 08:06 AM
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Originally Posted by HopefulFred View Post
I'm afraid not. Expanded polystyrene is a closed-cell foam. Open-cell foam gets you into the right realm of materials, but in most cases a fiber is better. The material must have open but convoluted pathways for air to move through. It's the partial restriction of air movement that diminishes the sound wave propagation and ultimately the pressure level.

Something simple like cotton batting would be somewhat effective, but you need to be careful about flammability. Somewhere near you is an insulation distributor who will sell to the public. A roll of duct liner is pretty pricey, but very useful. Sometimes leftovers come up for sale in the classified section here.
Why not just fiberglass wall insulation covered by plastic
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post #11889 of 11890 Old 06-15-2017, 03:50 PM
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Originally Posted by FrankTR View Post
Why not just fiberglass wall insulation covered by plastic
Generally, people are concerned about glass fibers floating in the air. Duct liner has a bonded surface and is designed to be exposed to open circulating air. Also, I think duct liner has slightly better efficiency due to it's higher density. Check bobgolds
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post #11890 of 11890 Old Today, 06:55 PM
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I am pretty sure this is the right place to post this. If not feel free to shame and delete my post.

I have fallen into some ‘speaker fund money’ for some mid/high treatments of my extremely reflective room. It was my plan to DIY traps and I was hoping for some advice. My primary use of the system is music (HTPC/PS4/Blu-ray Player all don’t get used near as much as my Dragonfly). Rough sketch and photos of the room are attached. Please excuse the mess – we are still moving in. Also ignore the window coverings – it’s a rental.

FYI, the ceilings are 8 ft. If it’s important to wait, my dad has a good REW setup that he will be bringing over sometime late summer. The room needs to be treated as its highly reflective (right channel Audyssey pings echo like crazy off the wall behind and in front of the speaker). The room’s bass is a mess with many obvious modes and nulls from both the mains and sub no matter what placement I use for either. However, I don’t have the money for bass treatments currently.

My Gear
---------------
Mains: Tannoy Revolution XT 6F
Center: Polk CSi3
Sides: ADS L400
Sub: SVS PC32-25 with plate amp in external configuration due to air leakage
AVR: Marantz SR5010
Main Amp: Adcom GFA-535
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Last edited by t.stone13; Today at 07:08 PM.
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