Wayne Parham Messages: 18791 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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