crossover question

stevez · 10th May 2007, 07:04 PM

To those who have lots of experience designing crossovers: I've looked at several 2-way systems like the eros from speakerbuilder.net, and the waveguide project at Zaph audio, and when I simulate the crossovers, the tweeter cutoff points seem very high. Like 11 KHz or so but the design says the tweeter and woofer are crossed at like 2 or 3 KHz. Whats up with this?

DougL · 10th May 2007, 09:15 PM

What Simulation package are you using?

I have good luck replication both speaker workshop and
LPG-cad (sp) in soundeasy.

HTH

Doug

stevez · 11th May 2007, 07:30 AM

I actually wrote out the transfer function for the filter and found the pole. I then checked these results using PSpice and found the half power points and they matched the work I did on paper.

stevez · 11th May 2007, 07:31 AM

Actually for these crossovers I wrote out the transfer functions by hand to find the crossover points, the poles of the function. These didn't seems right to me so I check these results using PSpice and I got the same exact results. Half power point was way too high. What do you guys make of this?

stevez · 11th May 2007, 12:11 PM

oops, sorry for the double post.

jimangie1973 · 11th May 2007, 12:54 PM

Could you be mixing radians with Hz? Just a quick thought.

sreten · 11th May 2007, 01:24 PM

above is drivers with c/o, below is without, tweeter electrical is around 10Khz.

The acoustic c/o point is 2-3Khz.

/sreten.

stevez · 11th May 2007, 06:38 PM

I guess the waveguide boosted the frequencies below 11K so he had to cross it there.

jimangi- nah i pulled out the 2*PI

sreten · 12th May 2007, 02:36 PM

Quote:

Originally posted by stevez
I guess the waveguide boosted the frequencies below 11K so he had to cross it there.

jimangi- nah i pulled out the 2*PI

Hi, but the target ~ 2nd order L/R acoustic around 2.5kKz is achieved,

/sreten.

tinitus · 12th May 2007, 05:27 PM

Stevez,.....Try and calculate/sim a 2.order LR filter ..... and dissregard the inductor ....

... and you will see its quite closer to Zaphs

10th May 2007, 07:04 PM	#1
stevez diyAudio Member Join Date: Apr 2007	crossover question To those who have lots of experience designing crossovers: I've looked at several 2-way systems like the eros from speakerbuilder.net, and the waveguide project at Zaph audio, and when I simulate the crossovers, the tweeter cutoff points seem very high. Like 11 KHz or so but the design says the tweeter and woofer are crossed at like 2 or 3 KHz. Whats up with this?

10th May 2007, 09:15 PM	#2
DougL diyAudio Member Join Date: Feb 2004 Location: Wheaton IL. Blog Entries: 25	What Simulation package are you using? I have good luck replication both speaker workshop and LPG-cad (sp) in soundeasy. HTH Doug __________________ Scienta sine ars nihil est - Science without Art is nothing. (Implies the converse as well) Mater tua criceta fuit, et pater tuo redoluit bacarum sambucus

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11th May 2007, 07:30 AM	#3
stevez diyAudio Member Join Date: Apr 2007	I actually wrote out the transfer function for the filter and found the pole. I then checked these results using PSpice and found the half power points and they matched the work I did on paper.

11th May 2007, 07:31 AM	#4
stevez diyAudio Member Join Date: Apr 2007	Actually for these crossovers I wrote out the transfer functions by hand to find the crossover points, the poles of the function. These didn't seems right to me so I check these results using PSpice and I got the same exact results. Half power point was way too high. What do you guys make of this?

11th May 2007, 12:11 PM	#5
stevez diyAudio Member Join Date: Apr 2007	oops, sorry for the double post.

11th May 2007, 12:54 PM	#6
jimangie1973 diyAudio Member Join Date: Jan 2007	Could you be mixing radians with Hz? Just a quick thought.

11th May 2007, 01:24 PM	#7
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	above is drivers with c/o, below is without, tweeter electrical is around 10Khz. The acoustic c/o point is 2-3Khz. /sreten.

11th May 2007, 06:38 PM	#8
stevez diyAudio Member Join Date: Apr 2007	I guess the waveguide boosted the frequencies below 11K so he had to cross it there. jimangi- nah i pulled out the 2*PI

12th May 2007, 05:27 PM	#10
tinitus diyAudio Moderator Join Date: Nov 2005	Stevez,.....Try and calculate/sim a 2.order LR filter ..... and dissregard the inductor .... ... and you will see its quite closer to Zaphs

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