Acoustical Treatments Master Thread - Page 419 - AVS Forum | Home Theater Discussions And Reviews
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post #12541 of 12557 Old 11-23-2019, 06:06 PM
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Quote:
Originally Posted by PretzelFisch View Post
sound is a wave it wraps around and behind the speaker to hit the back wall. High frequencies do this a little less.
High frequencies do this not at all, above the baffle step frequency.
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post #12542 of 12557 Old 11-25-2019, 10:48 AM
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Originally Posted by ereed View Post
Looks like you have enough absorption in the room. I would just do range limiters for other traps and add diffusion on the rear wall or side wall if you want. In REW go to your RT60 and look at 250 to 4000hz. That will tell you how lively your room is.
I'm even less familiar with RT60 graphs than I am with waterfall graphs, but I took some measurements yesterday and attached the results below. I couldn't even begin to determine whether they are good, bad, or somewhere in between.

For the heck of it, I included the SPL results as well.
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post #12543 of 12557 Old 11-25-2019, 02:02 PM
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Quote:
Originally Posted by Swoosh830 View Post
I'm even less familiar with RT60 graphs than I am with waterfall graphs, but I took some measurements yesterday and attached the results below. I couldn't even begin to determine whether they are good, bad, or somewhere in between.

For the heck of it, I included the SPL results as well.
You have enough absorption.....RT60 looks good. Do rest of bass traps with range limiters for front wall and bass traps with diffusion on rear wall. You do not need anymore full broadband absorption in my opinion.

You want it to fall between .2 and .5 seconds for decay. Here is mine along with showing the settings on screen how to get the bars. Normally for small rooms the .2 to .3 is the goal. For larger rooms .3 to .5 seconds is the goal.
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Theater room: Sony 45es | 120 inch screen | Panasonic BDT500 | Rotel RMB-1077 | Outlaw Audio 976 | Klipsch RP-280F/RP-450C/RP-160M (x4) | Funk Audio subs (x2) | MiniDSP 2x4HD | Crowson D-501/Shadow-8 Actuators (x2) | Monster Power Conditioner | GIK acoustic panels

TV Room: Panny 60 inch | Rotel RMB-1075 | Rotel RSP-1068 | Axiom Audio M60/VP150/QS8

Last edited by ereed; 11-25-2019 at 02:06 PM.
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post #12544 of 12557 Old 11-25-2019, 02:54 PM
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Quote:
Originally Posted by ereed View Post
You have enough absorption.....RT60 looks good. Do rest of bass traps with range limiters for front wall and bass traps with diffusion on rear wall. You do not need anymore full broadband absorption in my opinion.

You want it to fall between .2 and .5 seconds for decay. Here is mine along with showing the settings on screen how to get the bars. Normally for small rooms the .2 to .3 is the goal. For larger rooms .3 to .5 seconds is the goal.
Awesome, I really appreciate the feedback and for the basics of what to look for in the RT60 graph. I already have the 4" thick panels on the rear wall with full range Tri-Traps in the rear corners. I attached a few pictures of my room a few posts back for reference. It's right around 2,000 cu. ft. That's good news that I can put the idea of hanging treatments on the ceiling to rest based on the amount of absorption I already have in place.

Based on your advice for the front corners that have yet to be treated, I'll likely go with range limited Tri-Traps. After adjusting the physical location of the sub in the front of my room closer to the wall, the Soffits would just be too big. I then took more measurements after some changes (phase, distance settings, etc.) and came up with the graph attached. Getting there...

Thanks again for recommending the RT60 measurements. I'll open up that file and make the changes necessary to get the bars so it's easier to read. It's always fun to learn something new that will help improve my room.
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post #12545 of 12557 Old 11-25-2019, 08:41 PM
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Quote:
Originally Posted by Swoosh830 View Post
Awesome, I really appreciate the feedback and for the basics of what to look for in the RT60 graph. I already have the 4" thick panels on the rear wall with full range Tri-Traps in the rear corners. I attached a few pictures of my room a few posts back for reference. It's right around 2,000 cu. ft. That's good news that I can put the idea of hanging treatments on the ceiling to rest based on the amount of absorption I already have in place.

Based on your advice for the front corners that have yet to be treated, I'll likely go with range limited Tri-Traps. After adjusting the physical location of the sub in the front of my room closer to the wall, the Soffits would just be too big. I then took more measurements after some changes (phase, distance settings, etc.) and came up with the graph attached. Getting there...

Thanks again for recommending the RT60 measurements. I'll open up that file and make the changes necessary to get the bars so it's easier to read. It's always fun to learn something new that will help improve my room.
Not sure what your plan is but lets assume you wanted to add more bass trapping and make room livelier at the same time. You could repurpose your 4 inch thick panels to the ceiling and put something such as Alpha 6A on rear wall. Just another option.

Theater room: Sony 45es | 120 inch screen | Panasonic BDT500 | Rotel RMB-1077 | Outlaw Audio 976 | Klipsch RP-280F/RP-450C/RP-160M (x4) | Funk Audio subs (x2) | MiniDSP 2x4HD | Crowson D-501/Shadow-8 Actuators (x2) | Monster Power Conditioner | GIK acoustic panels

TV Room: Panny 60 inch | Rotel RMB-1075 | Rotel RSP-1068 | Axiom Audio M60/VP150/QS8
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post #12546 of 12557 Old 11-26-2019, 06:57 AM
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Quote:
Originally Posted by ereed View Post
Not sure what your plan is but lets assume you wanted to add more bass trapping and make room livelier at the same time. You could repurpose your 4 inch thick panels to the ceiling and put something such as Alpha 6A on rear wall. Just another option.
I appreciate the suggestion. I think for now I'm going to start with adding a pair of GIK Tri-Traps w/ range limiters for the front corners of the room and see how much that improves things. I'll make a decision later on whether or not I want to stack another pair on top of them.
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post #12547 of 12557 Old 11-28-2019, 11:43 AM
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I'm finishing my theater build and need to figure out my acoustical treatments. My room is 21'x16'x8' with about 25" of that behind my acoustically transparent screen. I have two layers of 1" Linacoustic behind my screen and have some left over so I would like to build panels with the remnants of that. I'm thinking two 2'x4' panels vertically on each wall with a single layer of Linacoutic under some AT fabric. On the back wall I was thinking of a horizontal 2'x4' panel above my two chairs - would a double layer rather than a single layer of 1" Linacoustic be better? Also I'm planning on building a "false" panel as a door to hide by equipment - basically a 2'x4' frame covered in AT fabric with no treatment material inside so air can still flow to the equipment. Opposite of that on the other long wall is a door that's steel going to an unfinished basement. Would it make since to cover it with a 2'x4' panel with a layer of Linacoustic inside? I'm not sure how I would attach it, but I could probably figure something out with magnets.



Any thoughts or suggestions are appreciated. Pictures below.
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7.4.4 Theater Room: JVC-RS500, Silver Ticket AT 2.35:1 142”, Onkyo RZ830, Anthem PVA-7, Panasonic DBT-110, JBL Studio 530’s, 4 - 15" DIY Sealed Subs

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post #12548 of 12557 Old 11-28-2019, 12:01 PM
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Quote:
Originally Posted by Mocs123 View Post
I'm finishing my theater build and need to figure out my acoustical treatments. My room is 21'x16'x8' with about 25" of that behind my acoustically transparent screen. I have two layers of 1" Linacoustic behind my screen and have some left over so I would like to build panels with the remnants of that. I'm thinking two 2'x4' panels vertically on each wall with a single layer of Linacoutic under some AT fabric. On the back wall I was thinking of a horizontal 2'x4' panel above my two chairs - would a double layer rather than a single layer of 1" Linacoustic be better? Also I'm planning on building a "false" panel as a door to hide by equipment - basically a 2'x4' frame covered in AT fabric with no treatment material inside so air can still flow to the equipment. Opposite of that on the other long wall is a door that's steel going to an unfinished basement. Would it make since to cover it with a 2'x4' panel with a layer of Linacoustic inside? I'm not sure how I would attach it, but I could probably figure something out with magnets. Any thoughts or suggestions are appreciated. Pictures below.
Using lots of 1" thick will deaden the high frequencies, have negligible effect on midrange frequencies and none at all in the bass where room modes need attention. Do some measurements and get some proper stuff for fixing what needs to be fixed.

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post #12549 of 12557 Old 11-28-2019, 12:30 PM
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Quote:
Originally Posted by Kal Rubinson View Post
Using lots of 1" thick will deaden the high frequencies, have negligible effect on midrange frequencies and none at all in the bass where room modes need attention. Do some measurements and get some proper stuff for fixing what needs to be fixed.

What do you recomend? When I checked OC 703's acoustical specs it didn't look that much different than Linacoustic.

7.4.4 Theater Room: JVC-RS500, Silver Ticket AT 2.35:1 142”, Onkyo RZ830, Anthem PVA-7, Panasonic DBT-110, JBL Studio 530’s, 4 - 15" DIY Sealed Subs

3.1 Living Room: Samsung 64” F8500 Plasma, Anthem MRX 300, Dynaudio Audience 52’s, Dynaudio Audience 122C, NHT SubOne
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post #12550 of 12557 Old 11-28-2019, 07:43 PM
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Originally Posted by Mocs123 View Post
What do you recomend?
I don't know what Kal would recommend, but you might check out what I did. I built a Helmholtz style bass trap to take up most of the space behind my AT screen. My theater is similar dimensions to yours, and I think I got pretty good results from that.
https://www.avsforum.com/forum/19-de...l#post50093337
Sorry about the images, I have not relocated all my photos from photobucket, so I run out of bandwidth about 1 week into every month. Check back Sunday if you can't make out what I've done.

Last edited by HopefulFred; 11-28-2019 at 07:47 PM.
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post #12551 of 12557 Old 11-28-2019, 08:23 PM
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Originally Posted by HopefulFred View Post
I don't know what Kal would recommend, but you might check out what I did. I built a Helmholtz style bass trap to take up most of the space behind my AT screen. My theater is similar dimensions to yours, and I think I got pretty good results from that.
https://www.avsforum.com/forum/19-de...l#post50093337
Sorry about the images, I have not relocated all my photos from photobucket, so I run out of bandwidth about 1 week into every month. Check back Sunday if you can't make out what I've done.

Perhaps the panel on the back wall with 4" think Acoustimac Eco Core insulation? It's supposed to be better with low frequencies than OC703 or Rockwool. Then I could use my leftover Linacoustic for 1" side wall panels.

7.4.4 Theater Room: JVC-RS500, Silver Ticket AT 2.35:1 142”, Onkyo RZ830, Anthem PVA-7, Panasonic DBT-110, JBL Studio 530’s, 4 - 15" DIY Sealed Subs

3.1 Living Room: Samsung 64” F8500 Plasma, Anthem MRX 300, Dynaudio Audience 52’s, Dynaudio Audience 122C, NHT SubOne
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post #12552 of 12557 Old 11-28-2019, 08:26 PM
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Originally Posted by Mocs123 View Post
What do you recomend? When I checked OC 703's acoustical specs it didn't look that much different than Linacoustic.
It's not so much the material as it is the thickness (or lack thereof). I suggest you consult this forum or other sites with information about room modes and reflections and how to deal with them.

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post #12553 of 12557 Old 11-28-2019, 08:51 PM
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I can use two layers of 1" Linacustic on the sidewall panels and four layers on the back wall. I'm going to try and put panels on the first reflection points

7.4.4 Theater Room: JVC-RS500, Silver Ticket AT 2.35:1 142”, Onkyo RZ830, Anthem PVA-7, Panasonic DBT-110, JBL Studio 530’s, 4 - 15" DIY Sealed Subs

3.1 Living Room: Samsung 64” F8500 Plasma, Anthem MRX 300, Dynaudio Audience 52’s, Dynaudio Audience 122C, NHT SubOne
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post #12554 of 12557 Old 11-30-2019, 10:50 PM
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What's a good way to hang ceiling panels? I was thinking either use some French cleats or use some eye hooks connected by zip tie.
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post #12555 of 12557 Old 12-02-2019, 09:58 AM
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Originally Posted by Mocs123 View Post
I can use two layers of 1" Linacustic on the sidewall panels and four layers on the back wall. I'm going to try and put panels on the first reflection points
I'm far from an expert, but doubling up would be a step in the right direction. Can you fit 3 layers at the sides? Maybe one panel with 2 layers and one with 3 layers to vary the effect. I'd also consider using diffusion in the rear, there are lots of tutorials for DIY "skyline" or "quadratic residue diffusers (QRD)" on these and other forums. It looks like you have a reasonable amount of space on those walls, experiment with combinations!
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post #12556 of 12557 Old 12-05-2019, 03:35 PM
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I was about to order all of my fabric from a GOM re-seller then I thought I should ask if anyone found any good alternatives at a place like Joanne fabrics. I may hide my surrounds, but for the most part, its' only for treatments.
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post #12557 of 12557 Old 12-05-2019, 08:39 PM
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Martini Absorb was what i went with HD100 with NRC rating of 1.00 which was great for my needs.Ceilings will be done next year some time with the option of framing them if need to. There is no hazards while working with this product at all. Its non itchy.The product is a polyester fibre. It also costs half the price of some other brands and at the same time it is used in commercial buildings here in Australia. And it works great as i have personally tested it with my ears.Results were fantastic.
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