Posted by Wayne Parham [ 65.69.120.122 ] on January 07, 2004 at 01:36:40:

In Reply to: Re: Tweeter - Thank you, Wayne posted by Bill Wassilak on January 06, 2004 at 16:22:33:

Wavelength at the 175Hz crossover frequency is 6.5 feet. That gives a window of about a foot and a half to two feet to stay within 90^o to 120^o. The crossover will also introduce phase, but the point is that we're talking about critical distances of about a foot or two. If the depth is a foot, I'm pretty sure Charlie would find he's within a quarter-wavelenth or 90^o. If the distance is greater, then there may be reason to do some measurements and/or calculations to find out if the phase difference exceeds 120^o. That represents a third-wavelenth, where we start seeing the edge of nulls begin to develop.

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