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post #1 of 11 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 11 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 11 Old Yesterday, 02:37 PM
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how does one know where the "reflection points" are?
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post #4 of 11 Old Yesterday, 02:40 PM
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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 11 Old Yesterday, 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 11 Old Yesterday, 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 11 Old Yesterday, 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 11 Old Yesterday, 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 11 Old Yesterday, 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 11 Old Yesterday, 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 11 Old Yesterday, 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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