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Old 12th May 2010, 02:49 PM   #1
Defo is offline Defo  Norway
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Default Two-way crossover - suggestion?

Hey,

I would love to get some help with a simple crossover for the drivers below:

B&C DE10 in 18sound XT1086
B&C 8PE21

Could it work with a low value cap on the tweeter for CD compensation and as an appropriate high pass, and then just cross the midrange driver steep enough to match the natural roll of of the tweeter at aprox 1500 hz?

Thanks

Last edited by Defo; 12th May 2010 at 02:52 PM.
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Old 12th May 2010, 03:06 PM   #2
doug20 is offline doug20  United States
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Do you have the impulse measurements?

We could sim something, I have been playing with Speaker Workshop for the past little while and its getting to be pretty easy.

btw, why the DE10? I do not think it place nice below 2kHz? Of course with th 8" woofer you can easily set and XO above 2KHz so its not a big deal.
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Old 12th May 2010, 03:13 PM   #3
Defo is offline Defo  Norway
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Quote:
Originally Posted by doug20 View Post
Do you have the impulse measurements?

We could sim something, I have been playing with Speaker Workshop for the past little while and its getting to be pretty easy.

btw, why the DE10? I do not think it place nice below 2kHz? Of course with th 8" woofer you can easily set and XO above 2KHz so its not a big deal.
It falls of naturally around the area where an 8 incher matches the dispersion of the horn Don't have impulse measurements. I don't need an "high-end" crossover, just "hi-fi"
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Old 12th May 2010, 03:21 PM   #4
doug20 is offline doug20  United States
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Then something like a 2.2 uF cap for the tweeter and a simple XO for the 8" woofer

I only say 2.2 uF because that is what I used recently with my QSC waveguides. You will need an Lpad to though. Even "Hi Fi" is a little complex and needs measurements, no?

I enjoy this type of project though, I will follow the thread!
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Old 12th May 2010, 03:33 PM   #5
Defo is offline Defo  Norway
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Quote:
Originally Posted by doug20 View Post
Then something like a 2.2 uF cap for the tweeter and a simple XO for the 8" woofer

I only say 2.2 uF because that is what I used recently with my QSC waveguides. You will need an Lpad to though. Even "Hi Fi" is a little complex and needs measurements, no?

I enjoy this type of project though, I will follow the thread!
Cool How should the crossover for the woofer look? I understand we need to flatten impedance and need a pretty steep slope to match the steep rolloff of the tweeter. But the electrical part, components and such I have noe clue..
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Old 12th May 2010, 03:34 PM   #6
doug20 is offline doug20  United States
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Either you need to find the measurements or some recommended XOs for it.
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Old 12th May 2010, 07:23 PM   #7
Defo is offline Defo  Norway
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Quote:
Originally Posted by doug20 View Post
Either you need to find the measurements or some recommended XOs for it.
Measurements are on the manufacturer site here. Would be great if someone could take the trouble and just give me the values needed to flatten the impedance and to make a 3 or 4th order low pass...
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Old 12th May 2010, 07:27 PM   #8
doug20 is offline doug20  United States
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controlling the impedance just takes a resistor in parrellel with the driver.
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Old 12th May 2010, 07:29 PM   #9
doug20 is offline doug20  United States
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Try this for a 3rd order XO.

Speaker Crossover Network Design Formulas & Calculator (3rd Order Butterworth)
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Old 13th May 2010, 07:56 PM   #10
Defo is offline Defo  Norway
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Thanks After some a little more self study I think I will just go for a 2nd order filter to avoid phase shifts (given that I reverse polarity ofc.)

I tried to find out what values I need to flatten impedance, but a little too advanced math there for me...
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