Bass trap placement - high or low? Does it matter? - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 110 Old 12-28-10, 08:20 PM
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Re: Bass trap placement - high or low? Does it matter?

What effect are you going for?

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post #12 of 110 Old 12-28-10, 10:47 PM Thread Starter
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Re: Bass trap placement - high or low? Does it matter?

Quote:
DanTheMan wrote: View Post
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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post #13 of 110 Old 12-29-10, 12:21 AM
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Re: Bass trap placement - high or low? Does it matter?

ipsilateral--same side

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post #14 of 110 Old 12-29-10, 10:24 AM Thread Starter
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Re: Bass trap placement - high or low? Does it matter?

Same side as what?
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post #15 of 110 Old 12-29-10, 08:00 PM
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Re: Bass trap placement - high or low? Does it matter?

The loudspeaker.

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post #16 of 110 Old 01-09-11, 10:23 AM
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Re: Bass trap placement - high or low? Does it matter?

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...igenmodes.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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post #17 of 110 Old 01-09-11, 11:35 AM
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Re: Bass trap placement - high or low? Does it matter?

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.

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post #18 of 110 Old 12-02-13, 09:30 AM
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Re: Bass trap placement - high or low? Does it matter?

show pictures of bass traps in your room
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post #19 of 110 Old 02-17-14, 01:13 PM
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Re: Bass trap placement - high or low? Does it matter?

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
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post #20 of 110 Old 02-17-14, 02:10 PM
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Re: Bass trap placement - high or low? Does it matter?

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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