variable phase 0-180 deg.

[Marcelinho]

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]

oeps

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

 

[SpeakerBob]

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]

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.