Placement of acoustic panels - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 22 Old 05-23-2020, 12:11 PM - Thread Starter
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Placement of acoustic panels

Greetings, all. Theater is finally just about done as you can see in these pics. I'm going to be making DIY acoustic panels, probably 2" Roxul 60 (2x4 ft sheets). My question is where to put them. I am thinking one behind each speaker (total of 6). One at the first and second reflection points for the L and R speakers (total of 4), and one on the back door for a total of around 11. Can anyone offer any other input please? Dimensions of the room are 21x15x8. Thanks a lot, looking forward to hearing your opinions.
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post #2 of 22 Old 05-23-2020, 08:09 PM
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Originally Posted by Gary Mertz View Post
Greetings, all. Theater is finally just about done as you can see in these pics. I'm going to be making DIY acoustic panels, probably 2" Roxul 60 (2x4 ft sheets). My question is where to put them. I am thinking one behind each speaker (total of 6). One at the first and second reflection points for the L and R speakers (total of 4), and one on the back door for a total of around 11. Can anyone offer any other input please? Dimensions of the room are 21x15x8. Thanks a lot, looking forward to hearing your opinions.
I did mine at first reflection points on the left and right wall and one behind the seating. I did not use them behind the screen.

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post #3 of 22 Old 05-24-2020, 02:37 PM
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how does one know where the "reflection points" are?

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post #4 of 22 Old 05-24-2020, 02:40 PM
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Originally Posted by b_scott View Post
how does one know where the "reflection points" are?
Sit in your main seat.

Have a friend hold a mirror on the wall and move it around until you can see a speaker in the mirror.

That is a reflection point.

Do that on each side wall until you have noted where all speakers in the front are visible in the mirror.

Those are the places to place treatments.
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post #5 of 22 Old 05-24-2020, 02:42 PM
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thanks. So basically opposite the speaker. I mean technically you would almost have to do the entire room with enough speakers.

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post #6 of 22 Old 05-24-2020, 03:21 PM - Thread Starter
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The primary reflection points we should be concerned with are from the front mains. I also treat the secondary reflection points, which in this case should be right around where the side surrounds are located.
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post #7 of 22 Old 05-24-2020, 03:30 PM
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thanks! I will probably put some on my side walls across from each side speaker and also on my back wall to absorb my front ones.
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post #8 of 22 Old 05-24-2020, 05:41 PM
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Originally Posted by b_scott View Post
thanks! I will probably put some on my side walls across from each side speaker and also on my back wall to absorb my front ones.
The mirror test is what I used. That's why I have two panels on each of the left and right walls and one on the rear wall.

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post #9 of 22 Old 05-24-2020, 05:52 PM
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Some people like myself are only doing the second reflection point for the L/R speakers. You may want to try that first to see if you like it. It allows for a little more of an open soundstage. I had some panels on my first reflection points as well and ended up taking them down. It really is a personal preference. You may also really not need anything to the side of the seating area or to the rear side of you. Maybe just treat the rear wall enough so you don't get too much echo back there.
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post #10 of 22 Old 05-24-2020, 07:04 PM - Thread Starter
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Some people like myself are only doing the second reflection point for the L/R speakers. You may want to try that first to see if you like it. It allows for a little more of an open soundstage. I had some panels on my first reflection points as well and ended up taking them down. It really is a personal preference. You may also really not need anything to the side of the seating area or to the rear side of you. Maybe just treat the rear wall enough so you don't get too much echo back there.
In my last theater I did first and second but you bring up a good point, too. I'm trying to think ahead because Roxul 60 is very expensive to have shipped and I continue to be amazed that I can't find any around here. The more I buy the less expensive each piece becomes but if I don't need them then I'd just be wasting money. I am however also going to do a few bass traps and I believe I can use that material for those as well. Any opinion on that aspect of things?
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post #11 of 22 Old 05-24-2020, 07:12 PM
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You can use it for bass traps - just make them thick.



Too bad you're not close, as I've had the same problem, I was going to do DIY panels, but the shipping on the Roxul makes them not that much cheaper than buying them already made.

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post #12 of 22 Old 05-25-2020, 11:23 AM
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Originally Posted by Gary Mertz View Post
In my last theater I did first and second but you bring up a good point, too. I'm trying to think ahead because Roxul 60 is very expensive to have shipped and I continue to be amazed that I can't find any around here. The more I buy the less expensive each piece becomes but if I don't need them then I'd just be wasting money. I am however also going to do a few bass traps and I believe I can use that material for those as well. Any opinion on that aspect of things?
If you make them thick like Mocs123 said you can go ahead and make panels for the first and second reflection points and if you do like it better without the first reflection point you can use those panels elsewhere like the back of the room.
That's what I did. My panels are 4" thick and ended up using the first reflection panels as rear corner bass traps.
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post #13 of 22 Old 05-25-2020, 01:36 PM - Thread Starter
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If you make them thick like Mocs123 said you can go ahead and make panels for the first and second reflection points and if you do like it better without the first reflection point you can use those panels elsewhere like the back of the room.
That's what I did. My panels are 4" thick and ended up using the first reflection panels as rear corner bass traps.
With that 4" thickness did you put a space between the back of the panel and the wall? I'm also curious to know how you hung them? Certainly a lot of options.
EDIT: One more question if I may. With superchunk bass traps would it do me any good to put some on top of the Devastators I'm building? The Devs will go right in a corner and are 4' tall. That leaves me with about 4' above them to put a bass trap. Seems to me that would be a good use of space?

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post #14 of 22 Old 05-26-2020, 10:01 AM
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With that 4" thickness did you put a space between the back of the panel and the wall? I'm also curious to know how you hung them? Certainly a lot of options.
EDIT: One more question if I may. With superchunk bass traps would it do me any good to put some on top of the Devastators I'm building? The Devs will go right in a corner and are 4' tall. That leaves me with about 4' above them to put a bass trap. Seems to me that would be a good use of space?
When the panels were against the wall I just put them flat against the wall with no spacer.
The super chunk certainly won't hurt there. To see if truly need them you would have to do measurements first, but if you have extra material putting it there would be nice.
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post #15 of 22 Old 05-26-2020, 03:45 PM - Thread Starter
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Outstanding, thank you for your input! I'm trying to order as much as I think I'll need all at once to try to save on shipping, which is ridiculously priced. I still can't fathom why I can't find any locally but that's a whole other story.
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post #16 of 22 Old 06-11-2020, 10:40 PM
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anyone use curved diffuser panels to scatter sound? if so, which ones and/or how did you create them if you built?

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post #17 of 22 Old 06-12-2020, 03:59 AM
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anyone use curved diffuser panels to scatter sound? if so, which ones and/or how did you create them if you built?

Like these?


https://www.gikacoustics.com/product...ber-bass-trap/


I'm not 100% sure what's under the skin so it might be hard to DIY. If you just want a curved diffuser, could you get a piece of sheet plastic or plexiglass and just bend it to diffuse sound?
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post #18 of 22 Old 06-12-2020, 06:46 AM
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You can also buy 1/8" bendable plywood if that would be useful.
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post #19 of 22 Old 06-12-2020, 06:58 AM
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Like these?


https://www.gikacoustics.com/product...ber-bass-trap/


I'm not 100% sure what's under the skin so it might be hard to DIY. If you just want a curved diffuser, could you get a piece of sheet plastic or plexiglass and just bend it to diffuse sound?
Yes. But not $300 a pair.

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You can also buy 1/8" bendable plywood if that would be useful.
yeah I've watched a DIY job something similar to that:


Just wondered if anyone here had done that or found a cheaper premade one.
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post #20 of 22 Old 06-18-2020, 05:37 AM
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Yes. But not $300 a pair.


Just wondered if anyone here had done that or found a cheaper premade one.

I've heard of cutting a section of a big sonotube. You could probably get 3 out of one tube. I just don't know how available say a 20" diameter one is.
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post #21 of 22 Old 06-18-2020, 07:13 AM
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I've heard of cutting a section of a big sonotube. You could probably get 3 out of one tube. I just don't know how available say a 20" diameter one is.
interesting idea, thanks! looks like 24" models are around $80 apiece, which would be half the cost, but I'd have to make it myself too.

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post #22 of 22 Old 06-18-2020, 11:03 AM
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interesting idea, thanks! looks like 24" models are around $80 apiece, which would be half the cost, but I'd have to make it myself too.

Should be able to get 3 out of a 24" tube, so $27 each, maybe less if you can find tube local. You could just glue it to a piece of plywood, make some end caps and wrap in fabric. I don't know if there needs to be more to it to get the properties you're after though.
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