Low pass filter 10mH & 100uF what the freq cutoff Low pass filter 10mH & 100uF what the freq cutoff - diyAudio
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Low pass filter 10mH & 100uF what the freq cutoff
Low pass filter 10mH & 100uF what the freq cutoff
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Old 20th June 2016, 11:59 PM   #1
supernut is offline supernut  Thailand
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Default 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.
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Old 21st June 2016, 12:27 AM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by supernut View Post
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.
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Old 21st June 2016, 01:19 AM   #3
bwaslo is offline bwaslo  United States
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Or you can quickly model it with XSim (see my signature). The actual curve will depend on the impedance of the woofer.
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File Type: jpg 2nd order LPFs.jpg (16.6 KB, 107 views)
File Type: jpg 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.
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Old 21st June 2016, 03:44 AM   #4
supernut is offline supernut  Thailand
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Thank you so much for Xsim

Mr. Bwaslo
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Old 21st June 2016, 04:16 AM   #5
supernut is offline supernut  Thailand
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SEAS-3-Way-Classic-mkII

Anyone knows the value of parts of this crossover. Thank you.
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Old 21st June 2016, 04:45 AM   #6
supernut is offline supernut  Thailand
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I try to calculate my Seas P25REX crossover but got wrong result.

Anyone help me
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Old 21st June 2016, 06:37 AM   #7
bwaslo is offline bwaslo  United States
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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!)
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Old 21st June 2016, 06:51 AM   #8
supernut is offline supernut  Thailand
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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.
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Old 21st June 2016, 10:30 AM   #9
Lojzek is offline Lojzek  Croatia
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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.
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Old 21st June 2016, 12:33 PM   #10
supernut is offline supernut  Thailand
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I will try. Thank you so much Mr. Lojzek.
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