Re: phase

Planar Speaker Asylum

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In Reply to: Re: phase posted by Arbelos on April 27, 2002 at 09:25:03:

I'm varying the phase strictly with mathematics (i.e. by rotating the vectors). There's no change to the crossover; the phase shifts are due to distance. I think of a triangle with the listener, woofer center, and tweeter center at the vertices. The difference in the length of the sides adjacent to the listener causes phase shift. At 600Hz, only 2.5 inches of difference will lead to a 45 degree phase shift. This is why looking at only the exact vector sum of the crossover electrical outputs gives a very incomplete picture.
You are right in that the sum of the magnitudes does not represent any acoustic quantity. What I am trying to do is to integrate the total output of all drivers over an imaginary sphere surrounding the speaker to get an idea of the energy fed into the room by the speaker. Since I don't know how to solve that problem, I am using the sum of the magnitudes as a proxy. It seems to work in my MG1.6 crossover redesign.
Ed

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Follow Ups Full Thread

Topic - Butterwirth vs. Linkwitz-Riley - beluga 02:42:36 04/24/02 (7)

Re: Butterwirth vs. Linkwitz-Riley - Arbelos 14:24:04 04/25/02 (6)

Re: Butterwirth vs. Linkwitz-Riley - crossover frequency? - beluga 08:37:42 04/26/02 (4)

phase - EdG 08:01:04 04/27/02 (3)

Re: phase - Arbelos 09:25:03 04/27/02 (2)

Re: phase - EdG 04/27/0211:00:11 04/27/02 (1)

Re: phase - constantly changing - beluga 08:29:59 04/28/02 (0)

Thanks Arbelos! - beluga 08:11:37 04/26/02 (0)

Follow Ups

Re: phase - EdG 04/27/0211:00:11 04/27/02 (1)

Re: phase - constantly changing - beluga 08:29:59 04/28/02 (0)

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