Help choosing Xover points

SamClassA · 24th September 2006, 12:28 PM

Hi, I have aquired the following 3 drivers and need to determine the best xover points in order to design the 3 way Filters.

Bass: Seas CA25RE4X/DC, Midrange: Vifa: P13WH-00-08, and Tweeter: Vifa: XT25TG30-04. I have looked at their individual frequency graphsand my inexperienced knowledge would choose 500Hz and 1200Hz. ?? How does this sound to you??

Also which order Filters would be a good choice, a 1st, 2nd or 3rd Oder?? From what I have read I would go for a 2nd Oder?? because its fairly simple and has good roll off?? Again ant suggestions welcomed.

Cal Weldon · 24th September 2006, 05:01 PM

If you could post the parameters instead of us looking them up, it would be easier to help.

Try to XO at at least twice the resonant frequency. If your drivers are robust and well matched sometimes 1st order can be very pleasing. 2nd order is often chosen because it's a good compromise between overlap, power handling and number of components in your filter.

4th order is valuable when you need the power handling and the drivers don't go that well together. ie: PA gear where you're going from a 15" to a 1" or 2" compression driver.

SamClassA · 25th September 2006, 04:56 AM

Hi carl, I have added the driver parameters, I dont know if these are sufficient to help??

keyser · 25th September 2006, 04:50 PM

Try to cross woof to mid between 250 and 600 hz. Mid to tweet not lower than 2500hz. Maybe 3000.
The tweeter may run flat pretty low, but it'll be excursion limited if crossed that low. This will result in high distortion and a certain death when played loud.

SamClassA · 26th September 2006, 12:29 AM

thanks keyse, good idea about mid to high cross over

24th September 2006, 12:28 PM	#1
SamClassA diyAudio Member Join Date: Jul 2006	Help choosing Xover points Hi, I have aquired the following 3 drivers and need to determine the best xover points in order to design the 3 way Filters. Bass: Seas CA25RE4X/DC, Midrange: Vifa: P13WH-00-08, and Tweeter: Vifa: XT25TG30-04. I have looked at their individual frequency graphsand my inexperienced knowledge would choose 500Hz and 1200Hz. ?? How does this sound to you?? Also which order Filters would be a good choice, a 1st, 2nd or 3rd Oder?? From what I have read I would go for a 2nd Oder?? because its fairly simple and has good roll off?? Again ant suggestions welcomed.

24th September 2006, 05:01 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	If you could post the parameters instead of us looking them up, it would be easier to help. Try to XO at at least twice the resonant frequency. If your drivers are robust and well matched sometimes 1st order can be very pleasing. 2nd order is often chosen because it's a good compromise between overlap, power handling and number of components in your filter. 4th order is valuable when you need the power handling and the drivers don't go that well together. ie: PA gear where you're going from a 15" to a 1" or 2" compression driver. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

25th September 2006, 04:50 PM	#4
keyser diyAudio Member Join Date: Oct 2004 Location: The Netherlands	Try to cross woof to mid between 250 and 600 hz. Mid to tweet not lower than 2500hz. Maybe 3000. The tweeter may run flat pretty low, but it'll be excursion limited if crossed that low. This will result in high distortion and a certain death when played loud. __________________ "Convictions are more dangerous enemies of truth than lies" - Friedrich Nietzsche Cardioid-like + Waveguide 2-way

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26th September 2006, 12:29 AM	#5
SamClassA diyAudio Member Join Date: Jul 2006	thanks keyse, good idea about mid to high cross over

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