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Old 5th November 2012, 10:10 PM   #1
djn is offline djn  United States
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Default Multiple subs vs. Room treatments

Hi All, finally settled in the new house and working with a smaller room but still good size. I have two very good subs and all the bits to build two more. I know I have a standing wave at around 250hz so I plan on making good panels with OC703. Most likely 12 of them 2' x 4' x 3".

So I have this thought that I want to explore. I want to go with multiple subs to smooth out the nulls and peaks, BUT.....won't panels do that by absorbing the sound waves???

I can't seem to think this one through.
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Old 5th November 2012, 10:20 PM   #2
sreten is offline sreten  United Kingdom
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Originally Posted by djn View Post
I can't seem to think this one through.
Hi,

True, 250Hz is a very unlikely single problem.

rgds, sreten.
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Old 5th November 2012, 10:42 PM   #3
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Quote:
Originally Posted by djn View Post
I know I have a standing wave at around 250hz so I plan on making good panels with OC703. Most likely 12 of them 2' x 4' x 3".

So I have this thought that I want to explore. I want to go with multiple subs to smooth out the nulls and peaks, BUT.....won't panels do that by absorbing the sound waves???
The one inch 703 panels won't do much below 500 Hz, the 2 inch absorbs some more down to 250 Hz, leaving a dead high end and little LF absorption, which may sound "dead/boingy".

At any rate, the panels will do little in the "sub" 125 Hz range, so don't let them stop you from adding multiple subs.

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Old 5th November 2012, 10:58 PM   #4
tvrgeek is offline tvrgeek  United States
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Yea, the answer is "yes"

The only bass absorber I have that worked was a stack of FG roles in the corner. Very low WAF. Looking into panel traps instead.
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Old 5th November 2012, 11:16 PM   #5
djn is offline djn  United States
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The OC703 I will use is 3" thick
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Old 5th November 2012, 11:34 PM   #6
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The OC703 I will use is 3" thick
How does the 3" compare with the 2" in sound absorption below 250 Hz?
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Old 5th November 2012, 11:46 PM   #7
djn is offline djn  United States
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Don't know. Using phone so not much data
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Old 6th November 2012, 01:03 AM   #9
tb46 is offline tb46  United States
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Hi,

Don't get the room to "dead".

Another reference: http://www.bobgolds.com/AbsorptionCoefficients.htm

I'm attaching the data on OC70x panels.

Regards,
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Old 6th November 2012, 01:11 AM   #10
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I've had much better success with multiple subs than absorbers... easier on the eyes as well.

Placement is the key.

John L.
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