Passive crossover questions

e-side · 26th December 2005, 10:06 AM

Hi,

I recently read somewhere that exotic enclosures, like horns and dipoles, are difficult when designing a passive crossover. Why? Does a passive crossover change driver parameters, and so enclosure dimensions?

Secondly, when I use 2 bassdrivers wired in parallel, could I use only 1 crossover for both speakers, or would I need one for each driver?

regards

Erwin

Cal Weldon · 26th December 2005, 06:05 PM

Every passive XO has it's own set of challenges.

If you wire two drivers in parallel or series, you will need to change to value of the components to match the new impedance. You still only one XO.

Cal

e-side · 27th December 2005, 09:46 AM

Thanks for the reply Cal, but one question remains unanswered. Do driver parameters change? I read a paper about loudspeaker design which takes the resistance of the inductor in the crossover into account...

regards

Erwin

e-side · 1st January 2006, 03:16 PM

Anybody who knows if Qts and/or Qes change?

noodle_snacks · 1st January 2006, 03:54 PM

when two drivers are in parallel impedance is halved, eg simplistically speaking 4 ohms instead of 8. When impedance changes inductor and capacitor values change.

I think series resistance from inductors can effect qes and hence qts, changing driver parameters a bit, you should take this into account when designing boxes.

With two drivers in parallel you could also run a 2.5way for bafflestep compensation, as less power is wasted than doing it passively.

26th December 2005, 10:06 AM	#1
e-side diyAudio Member Join Date: Jun 2005 Location: The Netherlands	Passive crossover questions Hi, I recently read somewhere that exotic enclosures, like horns and dipoles, are difficult when designing a passive crossover. Why? Does a passive crossover change driver parameters, and so enclosure dimensions? Secondly, when I use 2 bassdrivers wired in parallel, could I use only 1 crossover for both speakers, or would I need one for each driver? regards Erwin

26th December 2005, 06:05 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Every passive XO has it's own set of challenges. If you wire two drivers in parallel or series, you will need to change to value of the components to match the new impedance. You still only one XO. Cal __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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27th December 2005, 09:46 AM	#3
e-side diyAudio Member Join Date: Jun 2005 Location: The Netherlands	Thanks for the reply Cal, but one question remains unanswered. Do driver parameters change? I read a paper about loudspeaker design which takes the resistance of the inductor in the crossover into account... regards Erwin

1st January 2006, 03:16 PM	#4
e-side diyAudio Member Join Date: Jun 2005 Location: The Netherlands	Anybody who knows if Qts and/or Qes change?

1st January 2006, 03:54 PM	#5
noodle_snacks diyAudio Member Join Date: Mar 2004 Location: Hobart, Tasmania	when two drivers are in parallel impedance is halved, eg simplistically speaking 4 ohms instead of 8. When impedance changes inductor and capacitor values change. I think series resistance from inductors can effect qes and hence qts, changing driver parameters a bit, you should take this into account when designing boxes. With two drivers in parallel you could also run a 2.5way for bafflestep compensation, as less power is wasted than doing it passively.

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