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Old 29th December 2006, 09:48 AM   #1
diyAudio Member
Join Date: Oct 2005
Default variable phase 0-180 deg.

I want to integrate my famous janis subwoofer to my system. I don't have the interphase-1 that belonged to it. So I'm constructing a active filter ( from the group buy). A third order filter at 100hz is required. That shouldn't be to difficult.
A variable phase 0-180 deg. is also highly recommended. So i thought a all-pass section should do the trick.

I'm confused about the math, if half the wafelength of 100hz is 6,8meter. With an allpass section i can compensate only for several tens' of centimeter.

please help
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Old 30th December 2006, 05:41 PM   #2
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Join Date: Oct 2005
Default oeps

Oeps, half the wavelenght of 100 Hz is 1,7 meter.
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Old 30th December 2006, 06:37 PM   #3
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Join Date: Aug 2002
Location: UK
Any use to you?



btw - this link comes up as the second result when you google 'subwoofer phase control' You did search didn't you?
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Old 31st December 2006, 01:14 AM   #4
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Join Date: Oct 2005
I did search, but with tunnel vision and wrong preconceptions.
Thanks for the link. It has several considerations i had not thought about.

It leaves me with some rethinking en studying.
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