Need advice: Acoustic Panel Placement w/pics

[rickdeth]

Hey all i had my dad build me some acoustic panel frames (6) of them sized 24"X48".

Im having a little trouble figuring out where i should place them in my room. I know of the first reflection points so if anyone can suggest to me any other tips or their thoughts on where in my room i should place them that would help me out immensely.

Ill be finishing them off with some black fabric and Roxul Rockboard 60 from ats acoustics.

I added a couple pictures on where i though i should or might place them.

Thanks in advance

Rick

[jomari]

an excellent amount of articles about reflections are found in my acoustic sticky found here. you can also see these theorems applied to real life situations, in the diy thread here.

Heres an excellent article about room reflections (first reflection more importantly), and how to address them using the 'mirror trick' or flashlight method.

home theater hi fi acoustic stuff.

basics would be what you're acoustic treaments are going to do...



a quick image showing you a little more about room reflections, and how it interacts with the listening position...



Can you send us more info as to the room dimensions et al?

More details, more specifics, more specific answers will entail.

Great room by the way and welcome to the foray!

[rickdeth]

Hey Jomari thanks for the info. I read a few of the stickies ill go through them again.

The room dimensions are

13'.5" Wide at the front soundstage area
13'.5" long on the wall that the door is on (up the the closet wall where the army of darkness poster is).
17' long on the wall that has the grindhouse poster on it
10'.8" for the back wall
7'.2" ceilings

Im just looking for advice if i am on the right track on placement. Having one on the door ? Maybe 2 along the side walls and 2 on the back wall ?

Ill do some more reading on your links.

Thanks again

rick

[Blown 4.3]

if it were me. place 3 on the left wall as best you could(forget the door). then mirror that on the right wall.

[kareface]

I've done acoustic calibration for many rooms including dampening. Many people think you can just pop panels in where ever. You don't realize that a panel can hurt more then help, and will do so in many positions. Unless you plan to run sweeps after each placement it's not a great idea just to toss them anywhere.

[kareface]

Just for celerity I'm not calling jomari moronic, lol. You can just tell who ever came up with that diagram wanted to move some merchandise.

[kareface]

The room diagram above is moronic. You'll end up over deadening the mids and highs and still coming up short on the lows. The first 2 are fine, but there isn't a great deal of celerity on how to fix the solution.

Placement is really easy, you want to start with the first reflection point to reduce reverb. Take a mirror and place it against each of the walls, adjust it along the walls until you can see the speaker that is closest to that wall from your listening position. You want to place the panel so the center is around ear height while sitting in the same position the mirror is in. You can use a thinner panel, 2" thick, spaced 2" from the wall. The second important position you want to get is behind the right and left speakers. This will improve imaging by slowing the reflections from the back wall. This panel should be placed so it's centered around majority of the drivers. This panel you want to be thicker, 4" and spaces 4" from the wall. Against the rear wall you want to use diffraction, if you dampen behind the listening position you'll end up with a dead space behind you which sounds unnatural. It's also harder for humans to pick up sounds coming from behind, and dampening the space behind should only be used when your rooms RT60 is in excess of 600ms.

[rickdeth]

Originally Posted by kareface

The room diagram above is moronic. You'll end up over deadening the mids and highs and still coming up short on the lows. The first 2 are fine, but there isn't a great deal of celerity on how to fix the solution.

Placement is really easy, you want to start with the first reflection point to reduce reverb. Take a mirror and place it against each of the walls, adjust it along the walls until you can see the speaker that is closest to that wall from your listening position. You want to place the panel so the center is around ear height while sitting in the same position the mirror is in. You can use a thinner panel, 2" thick, spaced 2" from the wall. The second important position you want to get is behind the right and left speakers. This will improve imaging by slowing the reflections from the back wall. This panel should be placed so it's centered around majority of the drivers. This panel you want to be thicker, 4" and spaces 4" from the wall. Against the rear wall you want to use diffraction, if you dampen behind the listening position you'll end up with a dead space behind you which sounds unnatural. It's also harder for humans to pick up sounds coming from behind, and dampening the space behind should only be used when your rooms RT60 is in excess of 600ms.

Thank you kareface! That was kinda the answer i was looking for. I was wondering about anything placed behind the left and right speakers up front.

Im still doing my reading/research.

Thanks rick