CD correction crossover

zerokelvin99 · 18th April 2012, 12:48 AM

Hello everyone again!

Now, I have google searched after google search but cannot find any definite links or circuit diagrams to help.

I currently need to shape the response of a compression driver a little. It needs around 3.5dB taken off 3.5K, 1.5 BW/Oct (Or thereabouts). Current crossover is a 24dB/oct 1K35.

Can anyone give me a helping hand? Even a point in the right direction would be great!

Many thanks,

Inductor · 18th April 2012, 05:51 AM

Use Series or Parallel Notch Filter Designer / Calculator
Parallel Notch Fliter Designer / Calculator
I have also used with success calculators from www.lautsprechershop.de
>crossover calculations: >RLC calculators
Strassacker: Speaker - kits - do it yourself
You have to test the interaction with the simulation of your drivers frd/zma's with some software and the layout of an adequate (yours) crossover.

zerokelvin99 · 18th April 2012, 08:37 AM

Hi Inductor,

Thanks for your quick reply

. I will try out these circuits tonight and get building!

Cheers,

zerokelvin99 · 18th April 2012, 11:14 PM

Have had promising results with this calculator Strassacker: Speaker - kits - do it yourself

Let me know if there'e anything glaringly wrong before I order parts please

I take it I don't need FRD/ZMA software as I have already arrived at these values with an equaliser? Hence taking into results the natural response

Thanks!

AllenB · 20th April 2012, 01:13 AM

There will still be interactions you should give some consideration to. For example, if you have a capacitor crossing this driver which is causing it to begin rolling off at 3k5, then its effect will be reduced by this bandstop filter. Another example is that if your driver had a higher impedance in this region then this filter will be less effective.

For both cases the answer could simply be to increase the value of resistor you have calculated. On the other hand you could model it, your choice. No doubt you'll have some phase change so you may have some slight unexpected changes around the crossover region.

18th April 2012, 12:48 AM	#1
zerokelvin99 diyAudio Member Join Date: Apr 2010 Location: uk	CD correction crossover Hello everyone again! Now, I have google searched after google search but cannot find any definite links or circuit diagrams to help. I currently need to shape the response of a compression driver a little. It needs around 3.5dB taken off 3.5K, 1.5 BW/Oct (Or thereabouts). Current crossover is a 24dB/oct 1K35. Can anyone give me a helping hand? Even a point in the right direction would be great! Many thanks,

18th April 2012, 05:51 AM	#2
Inductor diyAudio Member Join Date: Feb 2006 Location: Cascais	Use Series or Parallel Notch Filter Designer / Calculator Parallel Notch Fliter Designer / Calculator I have also used with success calculators from www.lautsprechershop.de >crossover calculations: >RLC calculators Strassacker: Speaker - kits - do it yourself You have to test the interaction with the simulation of your drivers frd/zma's with some software and the layout of an adequate (yours) crossover. __________________ NEXT-proaudio Portugal Estoril Jazz 2013

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18th April 2012, 08:37 AM	#3
zerokelvin99 diyAudio Member Join Date: Apr 2010 Location: uk	Hi Inductor, Thanks for your quick reply . I will try out these circuits tonight and get building! Cheers,

18th April 2012, 11:14 PM	#4
zerokelvin99 diyAudio Member Join Date: Apr 2010 Location: uk	Have had promising results with this calculator Strassacker: Speaker - kits - do it yourself Let me know if there'e anything glaringly wrong before I order parts please I take it I don't need FRD/ZMA software as I have already arrived at these values with an equaliser? Hence taking into results the natural response Thanks!

20th April 2012, 01:13 AM	#5
AllenB diyAudio Member Join Date: Oct 2008	There will still be interactions you should give some consideration to. For example, if you have a capacitor crossing this driver which is causing it to begin rolling off at 3k5, then its effect will be reduced by this bandstop filter. Another example is that if your driver had a higher impedance in this region then this filter will be less effective. For both cases the answer could simply be to increase the value of resistor you have calculated. On the other hand you could model it, your choice. No doubt you'll have some phase change so you may have some slight unexpected changes around the crossover region.