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Multi-Way Conventional loudspeakers with crossovers

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Old 17th November 2002, 12:40 PM   #11
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Join Date: Oct 2002
Location: Spain or the pueblo of Los Angeles
Default As to 4 pole slopes

The fact that the driver resonant frequency(on the low end) or high frequency rolloff (and directionality changes) are often less than a octave from the crossover frequency greatly contributes to the actual slope. The driver response is very much a part of the total acoustic response of the filter. To sum it up, you usally wind up with total response slope greater than that of the active filter contribution.

This get's even more convoluted since a 4th order slope is chosen to get even closer to the point where the drivers out of band response starts to fall off. You can wind up with something closer to a sixth order response. Mr. Dickason's loudspeaker books outline this fact very well.

Mr. Pass has given the world the first product to allow one to really exploit this design aproach and the manual for this product is required reading for DIY active crossovers.

XVR1 Owner's Manual

Loudspeaker Design Cookbook

Thanks again to Nelson for shining a bright light in another dark corner.


P.S. further reading:
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Old 17th November 2002, 01:23 PM   #12
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Location: Eugene, OR
Exactly, Fred.

And don't forget:

provides an excellent solution.
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Old 17th November 2002, 05:42 PM   #13
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Originally posted by Bill Fitzpatrick
And don't forget:
My XO Links Page

and some tube designs

community sites,, ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
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