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Old 30th October 2019, 11:47 PM   #1
maLx is offline maLx  United States
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Default Where to look?

Hi, All.

So in the process of fixing my room. I don't need the silver bullet answer, but I'd just like to know from some of the people here what process you would go through to solve the following:

I have a loudspeaker placed in my room. It's fairly flat when measured outside. When I place in my room, I have three bass nulls at my listening position. I have one at 60hz, one at 100hz, and one at 200hz.

I'm thinking these might be due to floor to ceiling reflections. My speaker is 3ft off the floor, 6 feet from the ceiling. Those measurements are 1/2 the wavelength of 60 and 100hz. See what I'm getting with? So some treatment on the ceiling should help.

I already have treatments in the corners of the room that fixed the muddy sound of the room.

Again, just a general question and would like some advice on where to look to solve the issue.

I am not interested in moving the speaker to a different location so please don't suggest that. This is more of an practice and learning experience rather than a final placement of the speaker.

Let me know and thanks!

Cheers,
J
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Old 7th November 2019, 10:30 AM   #2
AllenB is online now AllenB  Australia
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Quote:
Originally Posted by maLx View Post
I'm thinking these might be due to floor to ceiling reflections. My speaker is 3ft off the floor, 6 feet from the ceiling. Those measurements are 1/2 the wavelength of 60 and 100hz. See what I'm getting with?
I don't think this is right. How far is your listening position, how high are your ears from the floor, how high is your ceiling?
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Old 1st December 2019, 08:04 AM   #3
maLx is offline maLx  United States
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9ft ceilings, Iím 8 feet from
The speaker about.
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Old 1st December 2019, 08:06 AM   #4
maLx is offline maLx  United States
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Ears are about 4 from the floor but Iím on a couch. Back wall is far away.
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Old 1st December 2019, 08:53 AM   #5
AllenB is online now AllenB  Australia
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I would guess that your floor has the dimensions to cause a null a little over 200Hz and your ceiling at around 100Hz, should it be that simple.
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Old 2nd December 2019, 03:35 AM   #6
maLx is offline maLx  United States
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Cool thanks! Iím
Going to do some
More testing on this but thatís what I was thinking as well and just wanted a second opinion.
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Old 3rd December 2019, 02:18 PM   #7
william2001 is offline william2001  United States
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Use REW to play a test tone at your problem frequency. Walk the room with an SPL meter (a phone app works). A null at your listening position means there's somewhere else in the room that's loud at that frequency. Placing appropriate treatment there can help. I was able to greatly correct very deep nulls at 155Hz and 180Hz due to SBIR with treatment on the front wall along with speaker placement, as an example. Velocity based treatment quickly loses effectiveness below 100Hz. Something pressure based is likely much more effective if done properly.
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