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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: Re: Butterwirth vs. Linkwitz-Riley - crossover frequency? posted by beluga on April 26, 2002 at 08:37:42:
Beluga,
You may want to check the effects of adding phase shifts between the different crossover sections. The phase shifts simulate the effects of off-axis response (and undoubtedly there's some phase shift in the drivers themselves).In my modded 1.6 crossover, adding -45, 0, and +45 degrees of phase shift to the tweeter section causes the output to vary as shown in the dark blue curves below.
The dark blue curves are complex sums whereas the light blue curve is the sum of magnitudes.
At -45 degrees (bottom curve), a suckout starts to develop. Personally, I think the suckout is not as objectionable as a peak in the response - adding too much energy somewhere off-axis tends to be noticable due to the room reflecting that energy back to the listener, whereas suckouts tend to get filled in.
I think if you consider the response with phase shifts and design the crossover to minimize the off-axis peak, you won't need to separate the crossover frequencies by as much.
Ed
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Follow Ups
- phase - EdG 04/27/0208:01:04 04/27/02 (3)
- Re: phase - Arbelos 09:25:03 04/27/02 (2)
- Re: phase - EdG 11:00:11 04/27/02 (1)
- Re: phase - constantly changing - beluga 08:29:59 04/28/02 (0)
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