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Placement of Diffusors
Placement of Diffusors
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Old 8th December 2016, 02:50 PM   #1
POOH is offline POOH  United States
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Default Placement of Diffusors

I recently picked up 12 Auralex T'Fusor panels.

My room is 14.5 wide by 23 deep and my horns are pretty much butted up against the side walls firing down the long end of the room. The primary listening area is six feet out from the back wall. The system has pretty much controlled directivity down to 200 Hz and is mostly around 60-80 degree radiation.

Where do you recommend I start experimenting with placement of these panels?

I'm thinking of using a few of them behind me on the back wall.

Auralex Acoustics | T’Fusor? 3D Sound Diffusor

Thanks
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Old 8th December 2016, 05:12 PM   #2
AllenB is offline AllenB  Australia
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Placement of Diffusors
Not easy to suggest blind. I think the reverberant field should be diffuse. On one hand the speakers should be initially contributing to that. If there is a problem with the near walls that might seem like a good place to diffuse but it's debatable that this should be happening in the first place so the rear wall seems the safe place. I've seen them in the first half of the room but they would have to fit in with your early reflection goals. I would be considering their working range and decide what places want diffusion and what places want absorption.
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Old 8th December 2016, 06:23 PM   #3
bwaslo is offline bwaslo  United States
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Placement of Diffusors
If your speakers are very directional and pointed a little inward toward you, try putting the diffusors behind you and to the sides a little so that they catch the waves that fly past you and reflect it (delayed and diffused) back at you. I have that arrangement and it works well for me. Tried them on sides and in front between the speakers, but those didn't work as well (though maybe looked a little better!)
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Old 8th December 2016, 06:51 PM   #4
POOH is offline POOH  United States
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Thank you both.

bwaslo- are you saying catching the waves on the adjacent side wall behind me from the horn radiating from the opposite wall? That sounds like it might open things up. I will try this this weekend.
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Old 8th December 2016, 07:47 PM   #5
bwaslo is offline bwaslo  United States
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Placement of Diffusors
Yup. But try to get the delay as long as you can get it (move the diffusors as far back as possible)
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Old 8th December 2016, 09:41 PM   #6
frangus is offline frangus
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Not sure if it was placebo, but I seam to hear "problems" when placed behind and to the side of the head. But i am very close to the back wall so the diffusors are close

Scattered on the front wall (behind speakers and in centre) works well for me particularly where the upper bass and low mids spread around to the back and reflect directly off the panels. I spread the panels and sit them a foot forward of the wall to try to diffuse some of the bass frequencies as well

The first reflections from the floor works too but it is impractical

Last edited by frangus; 8th December 2016 at 09:43 PM.
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Old 8th December 2016, 10:50 PM   #7
wesayso is offline wesayso  Netherlands
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POOH, this might be a good idea if you have the space:
Click the image to open in full size.

Source: https://www.gearslutz.com/board/stud...ning-room.html

Jim set it up like that to control the timing of it as a true Haas kicker. By bouncing it off a second panel the diffused sound arrives as late like it would in a bigger room. He has it timed at ~24 ms after the mains:
Click the image to open in full size.
(as measured with the Demo version of APL_TDA software... You see the Haas kicker firing at 24 ms.
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Old 9th December 2016, 12:48 AM   #8
POOH is offline POOH  United States
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thanks again for all the advice. looks i need to read that thread and start experimenting
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Old 9th December 2016, 07:36 AM   #9
frangus is offline frangus
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Very interesting. Will have to read through that thread. Not sure how he was able to focus the reverb so tightly around 25ms...

Last edited by jazbo8; 9th December 2016 at 08:42 AM. Reason: Rule 18
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Old 9th December 2016, 08:07 PM   #10
Omholt is offline Omholt  Norway
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Placement of Diffusors
Your products are probably more scattering units than proper diffusors. And they aren't deep enough to cover much freq. area.

Generally though, diffusion works best where you have late arrival reflections.
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