variable phase 0-180 deg.

Marcelinho · 29th December 2006, 09:48 AM

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

Marcelinho · 30th December 2006, 05:41 PM

Oeps, half the wavelenght of 100 Hz is 1,7 meter.

RobWells · 30th December 2006, 06:37 PM

Any use to you?

http://sound.westhost.com/project103.htm

Cheers,

Rob

btw - this link comes up as the second result when you google 'subwoofer phase control' You did search didn't you?

Marcelinho · 31st December 2006, 01:14 AM

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.

29th December 2006, 09:48 AM	#1
Marcelinho diyAudio Member Join Date: Oct 2005	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

30th December 2006, 05:41 PM	#2
Marcelinho diyAudio Member Join Date: Oct 2005	oeps Oeps, half the wavelenght of 100 Hz is 1,7 meter.

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30th December 2006, 06:37 PM	#3
RobWells diyAudio Member Join Date: Aug 2002 Location: UK	Any use to you? http://sound.westhost.com/project103.htm Cheers, Rob btw - this link comes up as the second result when you google 'subwoofer phase control' You did search didn't you?

31st December 2006, 01:14 AM	#4
Marcelinho diyAudio Member 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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