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Discussion Starter #1
I got a set of 4 Acoustimac 48x24x4" corner traps, and I'm wondering where to put them. Should they go up near the ceiling or down by the floor or in the middle? Or does it make any difference? I don't want them right on the ground because I don't want my cats mistaking them for scratching posts, but I don't have to put them right up against the ceiling to keep them out of claw range.
 

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I'd keep them away from the cats for sure. Other than that you can take measurements to see where they are most effective. Probably won't be where you hope............. None the less, more is ultimately better than few.

Dan
 

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I'd keep them away from the cats for sure. Other than that you can take measurements to see where they are most effective. Probably won't be where you hope............. None the less, more is ultimately better than few.

Dan
Thanks, Dan. Does it matter if I have them firmly attached to the walls when I'm testing? Or can I just set them in place and take some measurements?
 

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Other than that you can take measurements to see where they are most effective.
But is there any general guidance on the issue of vertical positioning on a wall?

If the ideal place was found to be in the centre of a wall (between floor and Ceiling) would it make a significant difference to place them at the lower part of the wall - would it be the case that it would not be worth having them at all if you did this, or would it for example led to a % deterioration in performace?
 

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good that I found this thread, next week I will be installing my DIY bass trap... :bigsmile: will check it back to get more info.. :jiggy:
 

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But is there any general guidance on the issue of vertical positioning on a wall?
It depends on who you talk to.
If the ideal place was found to be in the centre of a wall (between floor and Ceiling) would it make a significant difference to place them at the lower part of the wall - would it be the case that it would not be worth having them at all if you did this, or would it for example led to a % deterioration in performace?
It would make a difference. Hard to say how much as every room is radically different. I'd place them somewhere near speaker/ear height in the corners behind the front main speakers d/t their broadband nature, but others could state reasonable placement options elsewhere.

Dan
 

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Thanks, would it make a difference on placrement of bass traps if using these tall floor standing units? Seeing that the cones go all the way down from the upper tweeter, I was thinking that the panels would go on the walls in the same vertical area (I will of course plot the reflection points to mark horizontal positions on the walls).
 

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Everything makes a difference. In general, you want to absorb the whole front wall with something thick like 4" thick or so. Bass trapping the front corners with broadband absorption like John has. The next absorption point would be your first ipsilateral reflection and then the middle of the rear wall. Some people will also recommend absorbing the first reflection from the ceiling.

Dan
 

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Thanks, I understand that but my question is about the vertical placement of the traps at any given location. For example, on the rear and side wall reflection points, would it be ok to place them from skirting level up to match the height of the speakers shown, or do they have to be from the centre of the tweeter up?
 

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Discussion Starter #12
The next absorption point would be your first ipsilateral reflection and then the middle of the rear wall.
What's an ipsilateral reflection?

Here's what I have so far. Looking from the back of the living room to the front, you can see I have bass traps in the front corners. They're just sitting on top of the subs right now. There's a big opening to the left that leads into the dining room.



Looking to the left, you can see the opening, and there's a big blank section of wall.



Looking to the right, you see the outside wall of the house with two windows.



And from the front of the living room to the back, you see the other two bass traps, which are just resting on chairs right now. There's another big opening at the back of the room. As far as I can tell, the cocker spaniel has no measurable effect on sound quality.



I'm thinking about getting some big movie theater style curtains for the back. I'm not sure how the dining room opening might affect reflections. That side of the room is definitely quieter. My right front speaker is at -4 dB to bring it in line with the left.
 

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If you put them in the corners - as John did - as bass traps, the height doesn't matter. The standing waves are in the whole corner. See this calculator, representing the locations of the standing waves. Your panels are most effective at this places. http://www.hunecke.de/en/calculators/room-eigenmodes.html
If you absorb early reflections (put them on the left or right wall, between you and the speakers) they would ideally be from floor to ceiling. However, I'd try to cover the area of the speakers at least. In your case, put them slightly above the floor, to where they reach in height.
 

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The dark regions in that simulation represent high pressure regions and are technically the least effective place to put a broadband absorber to reduce bass problems. Placing them in the light regions would be the most effective--where particle velocity is at a max. If you had a diaphragmatic absorber, the dark area would be the most effective place.

Dan
 

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Hello

There are so many threads about bass traps that I did not want to start my own.
But I have a question, Why should I use bass traps?

I have a 5,4x3,4m square room, and in the middle of the room I have a -10db drop at 20-50hz.
If I place bass traps in the corners, roof etc.. will that increase the volume in this frequency levels ?



cheers :D
 

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It's possible that your 10dB drop in level isn't actually a drop, just a normal level valley between two loud peaks.

Bass traps work by absorbing bass energy. As such, they can't increase the volume of the dip as much as bring down the peaks on either side, giving you smoother bass response.

Once the bass response is smooth, you can raise the bass level to whatever you like.
 
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