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Position of nulls from adjacent sound sources [message #63662 is a reply to message #63661]

Wed, 04 August 2010 22:16

Wayne Parham
Messages: 18790
Registered: January 2001

Illuminati (33rd Degree)

I think you are talking about two 18" woofers with their edges 4" to 6" apart, so roughly 22" to 24" center-to-center. If that's so, you can calculate the angle where the nulls will be at their maximum using the formula below:

a = arcsin (λc/2d₁)

where:

d₁ is the center-to-center distance between sound sources
λc is the wavelength
a is the half-angle between nulls (2a is the arc between nulls)

so:

d₁ = 0.61m (24") between the woofer centers
λc = 0.43m (17") wavelength of 800Hz
a = 20° or 2a = 40° (arc between nulls)

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[Message index]

		Kilomax-18 By: Wayne-o on Wed, 21 July 2010 13:19
		Re: Kilomax-18 By: Wayne Parham on Wed, 21 July 2010 15:58
		Re: Kilomax-18 By: Wayne-o on Wed, 21 July 2010 21:36
		Re: Kilomax-18 By: Wayne Parham on Wed, 21 July 2010 22:45
		Please forgive my jumping in... By: GarlandB on Thu, 22 July 2010 12:11
		Omega 15 and Delta 15 By: Wayne Parham on Thu, 22 July 2010 13:02
		Re: Omega 15 and Delta 15 By: Wayne-o on Thu, 22 July 2010 18:51
		Re: Omega 15 and Delta 15 By: Wayne Parham on Thu, 22 July 2010 19:01
		Re: Kilomax-18 By: Wayne-o on Thu, 22 July 2010 21:47
		Re: Kilomax-18 By: Wayne Parham on Fri, 23 July 2010 08:05
		Re: Kilomax-18 By: Wayne-o on Sun, 25 July 2010 00:34
		Modal smoothing using dense interference from multiple sound sources By: Wayne Parham on Sun, 25 July 2010 09:37
		Re: Modal smoothing using dense interference from multiple sound sources By: Wayne-o on Wed, 04 August 2010 21:24
		Position of nulls from adjacent sound sources By: Wayne Parham on Wed, 04 August 2010 22:16
		Re: Position of nulls from adjacent sound sources By: Wayne-o on Thu, 05 August 2010 12:29
		Re: Position of nulls from adjacent sound sources By: Wayne Parham on Thu, 05 August 2010 13:24

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