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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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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
http://www.passlabs.com/pdf/XVR1MAN1.PDF

Loudspeaker Design Cookbook
http://www.mfr-eng.com/ldc.htm

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

Fred

P.S. further reading:
http://www.rane.com/pdf/note147.pdf
http://www.rane.com/pdf/linriley.pdf
http://www.rane.com/note107.html
http://www.rane.com/note119.html
http://www.pvconsultants.com/audio/frdgroup.htm
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Old 17th November 2002, 01:23 PM   #12
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Exactly, Fred.

And don't forget:

http://www.kbacoustics.com/ygbsm/2wa...led/index.html

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

and some tube designs

dave
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