Crossover Frequency Question

Decado · 26th July 2005, 06:32 AM

Hi, i was wondering what kind of 3 way crossover i should get for these speakers (was thinking about one of the dayton ones on parts express):

woofer - http://www.partsexpress.com/pe/showd...number=290-105

mid - http://www.partsexpress.com/pe/showd...number=280-045

tweeter - http://www.partsexpress.com/pe/showd...number=270-034

Should i get the 375/3000 hz, the 500/4000hz, the 625/5000hz, or the 700/5600 hz one. I dont understand how i choose the frequencies of the crossover. I tried searching the forums for an answer but couldnt really find anything.
Thx.

Cal Weldon · 26th July 2005, 03:38 PM

Hi Decado,

Just wondering why you chose those particular drivers? That's some rather lightweight stuff, good for your kids bedroom or maybe an office. What will you be using them for?

Cal

BobEllis · 26th July 2005, 04:08 PM

Generally for the easiest integration, choose your crossover frequency in the middle of a smooth overlap area.

Stock crossovers are not likely to work well with those drivers. The midrange has significantly lower sensitivity than the woofer. This is fine if you include baffle step compensation, which reduces the apparent sensitivity of the woofer. Unfortunately, standard XO's rarely include it. You will also need to pad down the tweeter to match the midrange sensitivity.

It sounds like this may be your first project. I suggest sticking with an established design, with a crossover specifically designed for your drivers and cabinet.

Decado · 27th July 2005, 06:28 AM

Uhh, how do i go about doing that?

BobEllis · 27th July 2005, 11:08 AM

Look for smooth response at least an octave on either side of the proposed XO freq to give textbook crossovers the best chance of sounding decent. For example, if you are shooting for a 300 Hz XO, your woofer should have smooth response to at least 600 Hz and the mid should go down below 150. You can also use a driver's natural roll off to form part or all of teh xo slope. either way your results will be best if you measure your drivers in your cabinets and design a crossover for that use.

See this thread for suggested reading: http://www.diyaudio.com/forums/showt...486#post690486

Bose(o) · 28th July 2005, 04:13 AM

If it's your first project, I recommend you read up and purchase a kit.

Good Luck!

26th July 2005, 06:32 AM	#1
Decado diyAudio Member Join Date: Jul 2005 Location: Crystal, Minnesota	Crossover Frequency Question Hi, i was wondering what kind of 3 way crossover i should get for these speakers (was thinking about one of the dayton ones on parts express): woofer - http://www.partsexpress.com/pe/showd...number=290-105 mid - http://www.partsexpress.com/pe/showd...number=280-045 tweeter - http://www.partsexpress.com/pe/showd...number=270-034 Should i get the 375/3000 hz, the 500/4000hz, the 625/5000hz, or the 700/5600 hz one. I dont understand how i choose the frequencies of the crossover. I tried searching the forums for an answer but couldnt really find anything. Thx.

26th July 2005, 03:38 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Hi Decado, Just wondering why you chose those particular drivers? That's some rather lightweight stuff, good for your kids bedroom or maybe an office. What will you be using them for? Cal __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

28th July 2005, 04:13 AM	#6
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	If it's your first project, I recommend you read up and purchase a kit. Good Luck! __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild

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26th July 2005, 04:08 PM	#3
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Generally for the easiest integration, choose your crossover frequency in the middle of a smooth overlap area. Stock crossovers are not likely to work well with those drivers. The midrange has significantly lower sensitivity than the woofer. This is fine if you include baffle step compensation, which reduces the apparent sensitivity of the woofer. Unfortunately, standard XO's rarely include it. You will also need to pad down the tweeter to match the midrange sensitivity. It sounds like this may be your first project. I suggest sticking with an established design, with a crossover specifically designed for your drivers and cabinet.

27th July 2005, 06:28 AM	#4
Decado diyAudio Member Join Date: Jul 2005 Location: Crystal, Minnesota	Uhh, how do i go about doing that?

27th July 2005, 11:08 AM	#5
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Look for smooth response at least an octave on either side of the proposed XO freq to give textbook crossovers the best chance of sounding decent. For example, if you are shooting for a 300 Hz XO, your woofer should have smooth response to at least 600 Hz and the mid should go down below 150. You can also use a driver's natural roll off to form part or all of teh xo slope. either way your results will be best if you measure your drivers in your cabinets and design a crossover for that use. See this thread for suggested reading: http://www.diyaudio.com/forums/showt...486#post690486

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