Crossover desing

porfi4ever · 15th February 2004, 09:45 PM

Hi guys, this is my first post here trying to desing a small speaker base on tang bang w4-616s and dynavox tweeter that needs an l-pad attenuator (tweeter sensitivity is 94 db and woofer is 88 db) . I was using winISD alpha software to model the box, but I'm not sure of the crossover values that I got. L1=25.72mh ; C1=401.92; L2=0.6mh ; C2=9.38 and resistro vaues are R1=46.89 and R2=94.45 please need your help !!

sreten · 15th February 2004, 09:55 PM

Read up on baffle step compensation,

sreten.

Bose(o) · 15th February 2004, 11:56 PM

Those are insanely wild resistor values!
Lemme check and see what I can find.

Bose(o) · 16th February 2004, 12:04 AM

Alright for the R values...attenuating the TB 4dB, you should get R1=2.95ohm and R2=13.68ohm. As for your other values, those are xo values for a 2nd order crossover.

porfi4ever · 16th February 2004, 12:50 AM

Hi Bose, you said attenuatting TB 4dbb, but I thought is the tweeter that you have to attenuated 6db because the tweeter is 94db and the woofer is 88db. Can you tell me how did you get those numbers?

Bose(o) · 17th February 2004, 02:14 AM

Oh, okay.

From this link, it says the tweet has a sensitivity of 92dB.
Tweet

Anyway, if you need 4dB. attenuation on a 6ohm driver, that is what you use.

Is that what you get in WinISD? I'm using the beta version, perhaps you should check the units?

porfi4ever · 17th February 2004, 04:22 AM

Thanks Bose, that is what I am getting.

navin · 17th February 2004, 04:59 AM

hey guys please dont overlook BSC.

BSC is usually 6db but if the speakers are close to surfaces (walls, floor) then you can get away with less.

i'd say practically you'll be looking at a speaker that is 85db. (88db-3db for BSC).

that means you have to drop the tweeter to 85 db. also small parallel resistors distort the sound too much so try and stick to a parallel resistor above 10 ohms, preferably in the region of 20 ohms.

92-85=7db the calcullator on lalena.com will help.

Bose(o) · 17th February 2004, 07:20 PM

Assuming a two-way design where the mid-bass is being used up to say, 3000Hz. wouldn't that just cause a padded down mid-range? Considering, if we take into account for BSC then, we would want to remove it's effects in the lows and not the mids or highs. In my past experience, I haven't taken BSC into account and have had admireable results. I'm open to suggestions none the less.

porfi4ever · 17th February 2004, 09:23 PM

Hey guys remenber I'm a newbie. First, what is BSC? I'm going to crossover at 4500 (tweeter response is 1500-20khz and woofer w4-616s is 70-14khz) woofer sensitivity is 88db , tweeter is 94db, I did the attenuation for this one R1=3.99 OHMS R2=8.04OHMS using 2 way second order I got L1=25.72, C1=401.93, L2=0.6, C2=9.4 . How do you see those numbers. Thanks

15th February 2004, 09:45 PM	#1
porfi4ever diyAudio Member Join Date: Dec 2002 Location: Providence,R.I	Crossover desing Hi guys, this is my first post here trying to desing a small speaker base on tang bang w4-616s and dynavox tweeter that needs an l-pad attenuator (tweeter sensitivity is 94 db and woofer is 88 db) . I was using winISD alpha software to model the box, but I'm not sure of the crossover values that I got. L1=25.72mh ; C1=401.92; L2=0.6mh ; C2=9.38 and resistro vaues are R1=46.89 and R2=94.45 please need your help !!

15th February 2004, 11:56 PM	#3
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	Those are insanely wild resistor values! Lemme check and see what I can find. __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild

16th February 2004, 12:04 AM	#4
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	Alright for the R values...attenuating the TB 4dB, you should get R1=2.95ohm and R2=13.68ohm. As for your other values, those are xo values for a 2nd order crossover. __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild

16th February 2004, 12:50 AM	#5
porfi4ever diyAudio Member Join Date: Dec 2002 Location: Providence,R.I	croosover desing Hi Bose, you said attenuatting TB 4dbb, but I thought is the tweeter that you have to attenuated 6db because the tweeter is 94db and the woofer is 88db. Can you tell me how did you get those numbers?

17th February 2004, 02:14 AM	#6
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	Oh, okay. From this link, it says the tweet has a sensitivity of 92dB. Tweet Anyway, if you need 4dB. attenuation on a 6ohm driver, that is what you use. Is that what you get in WinISD? I'm using the beta version, perhaps you should check the units? __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild


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15th February 2004, 09:55 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Read up on baffle step compensation, sreten.

17th February 2004, 04:22 AM	#7
porfi4ever diyAudio Member Join Date: Dec 2002 Location: Providence,R.I	Thanks Bose, that is what I am getting.

17th February 2004, 04:59 AM	#8
navin diyAudio Member Join Date: Jan 2002 Location: Mumbai (Bombay), India	hey guys please dont overlook BSC. BSC is usually 6db but if the speakers are close to surfaces (walls, floor) then you can get away with less. i'd say practically you'll be looking at a speaker that is 85db. (88db-3db for BSC). that means you have to drop the tweeter to 85 db. also small parallel resistors distort the sound too much so try and stick to a parallel resistor above 10 ohms, preferably in the region of 20 ohms. 92-85=7db the calcullator on lalena.com will help. __________________ ...still looking for the holy grail.

17th February 2004, 07:20 PM	#9
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	Assuming a two-way design where the mid-bass is being used up to say, 3000Hz. wouldn't that just cause a padded down mid-range? Considering, if we take into account for BSC then, we would want to remove it's effects in the lows and not the mids or highs. In my past experience, I haven't taken BSC into account and have had admireable results. I'm open to suggestions none the less. __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild

17th February 2004, 09:23 PM	#10
porfi4ever diyAudio Member Join Date: Dec 2002 Location: Providence,R.I	Hey guys remenber I'm a newbie. First, what is BSC? I'm going to crossover at 4500 (tweeter response is 1500-20khz and woofer w4-616s is 70-14khz) woofer sensitivity is 88db , tweeter is 94db, I did the attenuation for this one R1=3.99 OHMS R2=8.04OHMS using 2 way second order I got L1=25.72, C1=401.93, L2=0.6, C2=9.4 . How do you see those numbers. Thanks

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