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Old 15th February 2004, 09:45 PM   #1
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Default 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 !!
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Old 15th February 2004, 09:55 PM   #2
sreten is offline sreten  United Kingdom
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Read up on baffle step compensation, sreten.
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Old 15th February 2004, 11:56 PM   #3
Bose(o) is offline Bose(o)  Canada
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Those are insanely wild resistor values!
Lemme check and see what I can find.
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Old 16th February 2004, 12:04 AM   #4
Bose(o) is offline Bose(o)  Canada
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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.
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Old 16th February 2004, 12:50 AM   #5
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Default 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?
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Old 17th February 2004, 02:14 AM   #6
Bose(o) is offline Bose(o)  Canada
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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?
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Old 17th February 2004, 04:22 AM   #7
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Thanks Bose, that is what I am getting.
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Old 17th February 2004, 04:59 AM   #8
navin is offline navin  India
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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.
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Old 17th February 2004, 07:20 PM   #9
Bose(o) is offline Bose(o)  Canada
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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.
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Old 17th February 2004, 09:23 PM   #10
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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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