Proprietary Xover design?

auriches · 12th January 2009, 03:42 AM

Hi all,

i was wondering if there are any types of proprietary crossover designs either developed by diy or commercially or does everyone use the typical butteworth or linkwitz etc?

how does one (diy-er) choose which type to use?

thanks

speakerdoctor · 12th January 2009, 04:21 AM

I suspect, at one time, Modafferi's INfinite slope crossover was proprietary.
Patent #7085389
http://www.patentstorm.us/patents/70...scription.html

It has been and is still used in a number of speakers.

The choosing of a crossover 'type' requires considerable knowledge of loudspeaker design concepts. Suggest you get your hands on a copy of Dickason's Loudspeaker Cookbook and study it for starters.

forr · 12th January 2009, 11:03 AM

Hi Auriches,

Have a look at these elliptic filters for crossovers :

Works well for me at 1.5 kHz (I prefer LR at 160 Hz)
The Best Active Crossover - Here!

NTM based on the same idea, more complicated
http://sound.westhost.com/articles/ntm-xover.htm

Implemented in digital processors under the NTM name for BSS.
With a little programmation, can also be implemented in XTA processors.

gedlee · 12th January 2009, 09:53 PM

The real point here is that the crossover filters have to be the total acoustic response - the electrical response is only part of the problem. So the electrical part of any competent crossover filter is not going to fit the "textbook" filter topologies. It's the final acoustic response that matters not what the electrical filters do. Transducers are anything buy simple devices and their response has to be part of the design. In general the electrical part has to be fit to them, not the other way arround.

forr · 12th January 2009, 10:10 PM

Another uncommon crossover :

Lecleach paper on crossovers

Of course, the transfer functions of loudspeakers have to be taken in account to get the intended repsonse. It's true for any crossover. However high slope crossovers are naturally a bit less sensitive to the out of band response non-linearities of the drivers.

12th January 2009, 03:42 AM	#1
auriches diyAudio Member Join Date: Jun 2007	Proprietary Xover design? Hi all, i was wondering if there are any types of proprietary crossover designs either developed by diy or commercially or does everyone use the typical butteworth or linkwitz etc? how does one (diy-er) choose which type to use? thanks

12th January 2009, 09:53 PM	#4
gedlee diyAudio Member Join Date: Dec 2004 Location: Novi, Michigan	The real point here is that the crossover filters have to be the total acoustic response - the electrical response is only part of the problem. So the electrical part of any competent crossover filter is not going to fit the "textbook" filter topologies. It's the final acoustic response that matters not what the electrical filters do. Transducers are anything buy simple devices and their response has to be part of the design. In general the electrical part has to be fit to them, not the other way arround. __________________ Earl Geddes Gedlee Website Read about the highly acclaimed Geddes loudspeakers

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12th January 2009, 04:21 AM	#2
speakerdoctor diyAudio Member Join Date: Sep 2006 Location: New England	I suspect, at one time, Modafferi's INfinite slope crossover was proprietary. Patent #7085389 http://www.patentstorm.us/patents/70...scription.html It has been and is still used in a number of speakers. The choosing of a crossover 'type' requires considerable knowledge of loudspeaker design concepts. Suggest you get your hands on a copy of Dickason's Loudspeaker Cookbook and study it for starters.

12th January 2009, 11:03 AM	#3
forr diyAudio Member Join Date: Dec 2004 Location: Next door	Hi Auriches, Have a look at these elliptic filters for crossovers : Works well for me at 1.5 kHz (I prefer LR at 160 Hz) The Best Active Crossover - Here! NTM based on the same idea, more complicated http://sound.westhost.com/articles/ntm-xover.htm Implemented in digital processors under the NTM name for BSS. With a little programmation, can also be implemented in XTA processors.

12th January 2009, 10:10 PM	#5
forr diyAudio Member Join Date: Dec 2004 Location: Next door	Another uncommon crossover : Lecleach paper on crossovers Of course, the transfer functions of loudspeakers have to be taken in account to get the intended repsonse. It's true for any crossover. However high slope crossovers are naturally a bit less sensitive to the out of band response non-linearities of the drivers.

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