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Passive low pass filter using only inductors?

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neazoi

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Is there any way to create a passive low pass filter for audio using only inductors (including their cores of course), not capacitors or other devices?

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Is there any way to create a passive low pass filter for audio using only inductors (including their cores of course), not capacitors or other devices?

All right, I have just realized that a single coil in series can cut-off higher frequencies and leave only audio. This is not sharp but the audio and MHz range of frequencies is too far appart.
Please correct me if I am wrong.
 

klystron

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Depending on the load resistance a single series L will have any -3dB LP cut-off frequency ; but for a LR filter the fall-off tempo will always be 20 dB / decade. For faster cut-off fall-off you need ti increase the order of the filter ; via multiple L an C components
 

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