Loudspeaker Filter Formula's

Lars Clausen · 14th November 2003, 10:45 AM

Hi

I have plans to program a loudspeaker filter calculator for free online use on my website.

Anyone know a good source for the theoretical formula's?

All the best from Denmark!

sonnya · 14th November 2003, 11:43 AM

I think this link is good.

http://www.diysubwoofers.org/

Ron E · 14th November 2003, 04:00 PM

Try:
Need help on x-over formula

Enjoy

busterno1 · 15th November 2003, 10:32 AM

try here if you like

http://hyperphysics.phy-astr.gsu.edu.../cross.html#c1

Lars Clausen · 17th November 2003, 10:23 PM

Thanks a lot you guys, i programmed the calculator based on your informations.

You can try the calculator here:

http://www.lcaudio.dk/com/passivexover.htm

Hopefully it gives correct results otherwise please let me know.

All the best!

Vigier · 17th November 2003, 11:40 PM

Hi Lars,

do you mind if I give my comments?

- the pictures I get when everything is calculated, I think they can be better? Maybe I'm going to far with this, but I see a lot of dots above and under the lines, and around the capacitors etc. (And when I compare it to other pictures on your website, they look better)
- I NEVER use the DC-resistance of the unit to calculate the crossover. It's very important that you use the impedance of the unit at the frequency you want to calculate the crossover for. If the impedancecurve isn't a straight line, and it never is, then you can't use the DC-resistance (the problems are around the impedance peaks you see in the lower frequencies and the impedance curves are going up when the frequency gets higher because of the inductance of the voicecoil.)

Maybe there comments are overdone, but I just wanted to say it

About the rest of your website: damn, I like the designs, especially the End Millennium amp!!!!

Grtz, Joris

Elso Kwak · 18th November 2003, 06:44 AM

Most loudspeaker crossover design formulas prove to be wrong when put to test in a simulator program like Microcap.......

LaMa · 18th November 2003, 07:37 AM

Quote:

Originally posted by Elso Kwak
Most loudspeaker crossover design formulas prove to be wrong when put to test in a simulator program like Microcap.......

But you have to have a starting point to optimize, in that case the equations mentioned will come in handy.

Elso Kwak · 18th November 2003, 07:47 AM

Quote:

Originally posted by LaMa

But you have to have a starting point to optimize, in that case the equations mentioned will come in handy.

Hi LaMa,
I don't think so. You have the wrong starting point to begin with.

Lars Clausen · 18th November 2003, 03:54 PM

ELSO what would you suggest as the better solution?

14th November 2003, 10:45 AM	#1
Lars Clausen diyAudio Member Join Date: Oct 2003 Location: The Lab	Loudspeaker Filter Formula's Hi I have plans to program a loudspeaker filter calculator for free online use on my website. Anyone know a good source for the theoretical formula's? All the best from Denmark!

14th November 2003, 04:00 PM	#3
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	Try: Need help on x-over formula Enjoy __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

18th November 2003, 06:44 AM	#7
Elso Kwak Banned Join Date: Dec 2001 Location: Zamboanga, City of Flowers, Mindanao	Loudspeaker Crossover Design Formulas Most loudspeaker crossover design formulas prove to be wrong when put to test in a simulator program like Microcap.......

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14th November 2003, 11:43 AM	#2
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	I think this link is good. http://www.diysubwoofers.org/

15th November 2003, 10:32 AM	#4
busterno1 diyAudio Member Join Date: Mar 2003 Location: brisbane queensland	try here if you like http://hyperphysics.phy-astr.gsu.edu.../cross.html#c1

17th November 2003, 10:23 PM	#5
Lars Clausen diyAudio Member Join Date: Oct 2003 Location: The Lab	Thanks a lot you guys, i programmed the calculator based on your informations. You can try the calculator here: http://www.lcaudio.dk/com/passivexover.htm Hopefully it gives correct results otherwise please let me know. All the best!

17th November 2003, 11:40 PM	#6
Vigier diyAudio Member Join Date: Nov 2002 Location: Netherlands	Hi Lars, do you mind if I give my comments? - the pictures I get when everything is calculated, I think they can be better? Maybe I'm going to far with this, but I see a lot of dots above and under the lines, and around the capacitors etc. (And when I compare it to other pictures on your website, they look better) - I NEVER use the DC-resistance of the unit to calculate the crossover. It's very important that you use the impedance of the unit at the frequency you want to calculate the crossover for. If the impedancecurve isn't a straight line, and it never is, then you can't use the DC-resistance (the problems are around the impedance peaks you see in the lower frequencies and the impedance curves are going up when the frequency gets higher because of the inductance of the voicecoil.) Maybe there comments are overdone, but I just wanted to say it About the rest of your website: damn, I like the designs, especially the End Millennium amp!!!! Grtz, Joris

18th November 2003, 03:54 PM	#10
Lars Clausen diyAudio Member Join Date: Oct 2003 Location: The Lab	ELSO what would you suggest as the better solution?

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