2nd order 3-way series xo (very rare)

Sony · 29th August 2005, 04:13 PM

Does any one know where I can find info on this very rare crossover (Schematics, calculators, etc.): 2nd order, 3-way and series topology.

Thks & Rgrds

Andy G · 29th August 2005, 10:26 PM

One does have to ask.. why ???

adason · 30th August 2005, 12:59 AM

go to pass labs web
diy
articles
nelson has an detailed article on paralel and series crossovers

rabbitz · 30th August 2005, 03:15 AM

AFAIK the 2nd order series doesn't have the sonic attributes of the 1st order series.

Would be a nightmare IMO but could be fun..... maybe.

Have a look at some info here.

http://home.zonnet.nl/geenius/Crossover.html

Andy G · 30th August 2005, 03:46 AM

IMHO, the aim of a series x-o is to COMBINE the drivers with the minimal amount of components. (sorta like a string bikini top)

With a parallel x-o you are trying to CONTROL and/or SEPARATE the drivers. (sports bra??)

Mind you, the full range guys prefer no x-o, I can see their point !!!

The main reason for using a second order series in a 2-way would be added protection for the tweeter, or to get away from the res point of something like the XT25. In a 3-way series, this should not be necessary, so a 2nd order 3-way series seems somewhat counter-productive

soongsc · 30th August 2005, 04:53 AM

Doesn't series XO have lower effeciency?

Sony · 30th August 2005, 09:39 AM

Well, the idea was not a pure 3-way series, but a 3-way series for the tweeter and midrange in paralell with a typical 2nd order branch for the woofer.
A 2-way series circuit won't work, of course, because it wouldn't provide the bandpass function for the mid-drive.

With this series+paralell setup, the woofer has its own connection and no loss of power. Tweeter and midrange have all the advantages of a series crossover.

I believe the 12dB/oct is necessary because it's important to have a low-frequency crossing between the woofer and midrange and the mid couldn't handle well the low frequencies provided by a 6dB/oct curve (1st order).

I have actually seen and listened to such a crossover and was surprised by the correct integration and overall sonic result (this goes beyond theory/fiction). Therefore, I would like to make one myself, but couldn't find any references. This will be one of my last attempts before giving up on the passive territory and going active.

Andy G · 30th August 2005, 10:56 AM

If you have some spare time, why not play with one of these??

http://users.tpg.com.au/users/gradds...ss-overs8b.htm

29th August 2005, 04:13 PM	#1
Sony diyAudio Member Join Date: Sep 2004 Location: Europe	2nd order 3-way series xo (very rare) Does any one know where I can find info on this very rare crossover (Schematics, calculators, etc.): 2nd order, 3-way and series topology. Thks & Rgrds

30th August 2005, 04:53 AM	#6
soongsc diyAudio Member Join Date: Mar 2005 Location: Taiwan	Doesn't series XO have lower effeciency? __________________ Hear the real thing!

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29th August 2005, 10:26 PM	#2
Andy G diyAudio Member Join Date: Apr 2002 Location: Newcastle, Australia	One does have to ask.. why ???

30th August 2005, 12:59 AM	#3
adason diyAudio Member Join Date: Nov 2004 Location: home sweet home	go to pass labs web diy articles nelson has an detailed article on paralel and series crossovers

30th August 2005, 03:15 AM	#4
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	AFAIK the 2nd order series doesn't have the sonic attributes of the 1st order series. Would be a nightmare IMO but could be fun..... maybe. Have a look at some info here. http://home.zonnet.nl/geenius/Crossover.html

30th August 2005, 03:46 AM	#5
Andy G diyAudio Member Join Date: Apr 2002 Location: Newcastle, Australia	IMHO, the aim of a series x-o is to COMBINE the drivers with the minimal amount of components. (sorta like a string bikini top) With a parallel x-o you are trying to CONTROL and/or SEPARATE the drivers. (sports bra??) Mind you, the full range guys prefer no x-o, I can see their point !!! The main reason for using a second order series in a 2-way would be added protection for the tweeter, or to get away from the res point of something like the XT25. In a 3-way series, this should not be necessary, so a 2nd order 3-way series seems somewhat counter-productive

30th August 2005, 09:39 AM	#7
Sony diyAudio Member Join Date: Sep 2004 Location: Europe	Well, the idea was not a pure 3-way series, but a 3-way series for the tweeter and midrange in paralell with a typical 2nd order branch for the woofer. A 2-way series circuit won't work, of course, because it wouldn't provide the bandpass function for the mid-drive. With this series+paralell setup, the woofer has its own connection and no loss of power. Tweeter and midrange have all the advantages of a series crossover. I believe the 12dB/oct is necessary because it's important to have a low-frequency crossing between the woofer and midrange and the mid couldn't handle well the low frequencies provided by a 6dB/oct curve (1st order). I have actually seen and listened to such a crossover and was surprised by the correct integration and overall sonic result (this goes beyond theory/fiction). Therefore, I would like to make one myself, but couldn't find any references. This will be one of my last attempts before giving up on the passive territory and going active.

30th August 2005, 10:56 AM	#8
Andy G diyAudio Member Join Date: Apr 2002 Location: Newcastle, Australia	If you have some spare time, why not play with one of these?? http://users.tpg.com.au/users/gradds...ss-overs8b.htm

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