Low pass filter 10mH & 100uF what the freq cutoff - diyAudio
 Low pass filter 10mH & 100uF what the freq cutoff
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 Multi-Way Conventional loudspeakers with crossovers

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supernut
diyAudio Member

Join Date: Jan 2012
Low pass filter 10mH & 100uF what the freq cutoff

If I put 10mH 15AWG on + line of speaker and put 100uF capacitor between + and - lines

How much the frequency cutoff I will get

I plan to use in my 10" subwoofer to have frequency cut off about 250 Hz below

2nd order is just fine.

Can anyone provide the calculator of L & C for low pass filter?

Thank you.
Attached Images
 Low pass.jpg (20.7 KB, 115 views)

rayma
diyAudio Member

Join Date: Apr 2011
Quote:
 Originally Posted by supernut If I put 10mH 15AWG on + line of speaker and put 100uF capacitor. Can anyone provide the calculator of L & C for low pass filter?
f = 1 / (2Pi SQRT(LC))

f = 1 / (2Pi SQRT(0.010H x 0.000100F)) = 159 Hz

Here's a calculator. http://sim.okawa-denshi.jp/en/RLClowkeisan.htm

Last edited by rayma; 21st June 2016 at 12:33 AM.

bwaslo
diyAudio Member

Join Date: May 2006
Location: Portland, Oregon!
Or you can quickly model it with XSim (see my signature). The actual curve will depend on the impedance of the woofer.
Attached Images
 2nd order LPFs.jpg (16.6 KB, 107 views) 2nd order LPFs curves.jpg (59.9 KB, 108 views)
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Last edited by bwaslo; 21st June 2016 at 01:25 AM.

 21st June 2016, 03:44 AM #4 supernut   diyAudio Member   Join Date: Jan 2012 Thank you so much for Xsim Mr. Bwaslo
 21st June 2016, 04:16 AM #5 supernut   diyAudio Member   Join Date: Jan 2012 SEAS-3-Way-Classic-mkII Anyone knows the value of parts of this crossover. Thank you.
supernut
diyAudio Member

Join Date: Jan 2012
I try to calculate my Seas P25REX crossover but got wrong result.

Anyone help me
Attached Images
 seas P25REX error.jpg (406.4 KB, 90 views)

 21st June 2016, 06:37 AM #7 bwaslo   diyAudio Member     Join Date: May 2006 Location: Portland, Oregon! The trace is off the top of the graph! Either turn down the voltage of the 'power amp', or use the scale menu on the response plot so you can see up there. To be completely accurate, you would need a zma file of the driver's impedance and a frd file of its frequency response. As default, XSim assumes a driver's impedance is pure 8 ohms resistive, and its response is flat with 70dBspl at 1V input. That will get you reasonably close on the effect of the crossover, assuming your driver is 8 ohms. If it is 4 ohms, just put another 8 ohm resistor across it in the model (but not in the actual crossover!) __________________ [W9MJE] Horn spreadsheet SynergyCalc/; SmallSyns SmallSyns; Crossover design Xsim; Depot diffusor super-easy diffusors
supernut
diyAudio Member

Join Date: Jan 2012
My woofer is 93dbl

I have download FRD file of 8" of SEAS. Mine is 10" SEAS.

Can you help me modify the graph?

I attached as ZIP file

My amp is 65 watts/Ch.
Attached Files
 Seas P25REX crossover.zip (3.9 KB, 5 views)

 21st June 2016, 10:30 AM #9 Lojzek   diyAudio Member     Join Date: Feb 2012 Location: Croatia You have entered in mod sensitivity the 93dB value which raised the overall spl to a level that you can't normally see without moving the vertical center of the SPL graph. Set it to 0 dB. Make a simulation based on manufacturer's box volume of 28 litres and its sensitivity plot at 0 deg which already has baffle step factored in. Trace the impedance plot of the same box. __________________ Mankind is created for eternity.
 21st June 2016, 12:33 PM #10 supernut   diyAudio Member   Join Date: Jan 2012 I will try. Thank you so much Mr. Lojzek.

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