Two-way crossover - suggestion?

Defo · 01:52 PM

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

doug20 · 12th May 2010, 02:06 PM

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.

Defo · 12th May 2010, 02:13 PM

Quote:

Originally Posted by doug20

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"

doug20 · 12th May 2010, 02:21 PM

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!

Defo · 12th May 2010, 02:33 PM

Quote:

Originally Posted by doug20

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..

doug20 · 12th May 2010, 02:34 PM

Either you need to find the measurements or some recommended XOs for it.

Defo · 12th May 2010, 06:23 PM

Quote:

Originally Posted by doug20

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...

doug20 · 12th May 2010, 06:27 PM

controlling the impedance just takes a resistor in parrellel with the driver.

doug20 · 12th May 2010, 06:29 PM

Try this for a 3rd order XO.

Speaker Crossover Network Design Formulas & Calculator (3rd Order Butterworth)

Defo · 13th May 2010, 06:56 PM

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...

12th May 2010, 01:49 PM	#1
Defo diyAudio Member Join Date: Nov 2008	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 01:52 PM.

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12th May 2010, 02:06 PM	#2
doug20 diyAudio Member Join Date: Mar 2009	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.

12th May 2010, 02:21 PM	#4
doug20 diyAudio Member Join Date: Mar 2009	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!

12th May 2010, 02:34 PM	#6
doug20 diyAudio Member Join Date: Mar 2009	Either you need to find the measurements or some recommended XOs for it.

12th May 2010, 06:27 PM	#8
doug20 diyAudio Member Join Date: Mar 2009	controlling the impedance just takes a resistor in parrellel with the driver.

12th May 2010, 06:29 PM	#9
doug20 diyAudio Member Join Date: Mar 2009	Try this for a 3rd order XO. Speaker Crossover Network Design Formulas & Calculator (3rd Order Butterworth)

13th May 2010, 06:56 PM	#10
Defo diyAudio Member Join Date: Nov 2008	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...