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Combing and distance: an odd question [message #23287]

Thu, 02 November 2006 08:57

Marlboro
Messages: 403
Registered: May 2009

Illuminati (1st Degree)

The previous question brings up another one. We want the speakers in line array to be close enough to each other to avoid combing effects. However, is there a distance apart where its not an issue anymore?

I mean, suppose you put a baffle that is 90 inches long. You put the tweeter dome array in the sitting at 36 inches from the floor and it goes to 66 inches from the floor. If you put a tweeter at 80 - 90 inches up, not in the line, is it far enough away to provide dispersions for the people walking around, and not be affected by c-to-c distances? How about one three feet away at the 80inch level not on the baffle , but facing the listening?

Marlboro

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Re: Combing and distance: an odd question [message #23288 is a reply to message #23287]

Thu, 02 November 2006 13:53

Wayne Parham
Messages: 18727
Registered: January 2001

Illuminati (33rd Degree)

Here's 2¢ worth of info about arrays with respect to interference, said simply. If you have a small number of sound sources greater than 1/4λ apart, then there will be nulls in response at frequencies and positions where cancellation occurs. But by using more sound sources, you can fill in the voids. This is called dense interference. If you go too far with this, intelligibility will suffer. But it is a way to smooth response and make a more uniform sound field when 1/4λ spacing between sound sources is impossible.

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