Audio low pass filter (crossover)?

Looking at a crossover inside a speaker box, I see some inductor coils and capacitors. As  understand, it seems capacitors are high pass components, and inductors are the low pass components. What is the formula converting frequency in Hz into inductance of the inductor coil and/ or value of the capacitor. (I would be looking for a crossover around 30 - 40 Hz) To me, it seems logical to put this crossover not in the speaker box, but in front of the amplifiers, so the remaining audio spectrum can selectively amplified, which should result in some more power...  True? (I see some recommendations for active crossovers, but the theory is way over my head).

Asked by BobS 8 years ago  |  last reply 6 years ago


Voltage controlled low pass filter with resonance schematics, anyone? Answered

Can anyone provide a link or schematic for an audio low-pass filter with resonance, with the low pass frequency able to be controlled with varying voltage? I'm hoping to make something like the moogerfooger, but I don't need an envelope filter.

Asked by aelias36 7 years ago  |  last reply 6 years ago


Low pass filter on LED Music Controller

I've purchased following controller: http://www.ebay.co.uk/itm/131775427312 I was wondering whether it was possible to create a lowpass filter with potmeter, so that the LED only will be changing to the low frequencies?

Posted by FrederikH5 2 years ago  |  last reply 2 years ago