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Subwoofer Bandpass filter

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audioguru

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The Lowpass Filter - Subwoofer... project was stolen from Electronics-Lab. It has an extremely poor translation and is full of errors.
 

Mike_2545

Super Moderator
The Lowpass Filter - Subwoofer... project was stolen from Electronics-Lab. It has an extremely poor translation and is full of errors.
Well i don't endorse 'em I'm just pointing out the many design possibilities found by goggling your needs.
I could have had him try this:
 

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Mdkanz

New Member
Would just a simple resistor capacitor lowpass filter work? and if it would what should the value of the resistor/capacitor be?
 

audioguru

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A resistor feeding a capacitor to ground makes a very poor filter that has attenuation of only 6dB per octave or only 20dB per decade of frequency.

If the cutoff frequency is 200Hz then 2kHz is attenuated only -20dB and is still audible. You don't want a sub-woofer producing mid-frequency sounds.

If you use a 3rd-order Butterworth lowpass filter and if it has a cutoff frequency of 200Hz then 2kHz will be -60dB which is not audible.
 
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