Audio low pass filter (crossover)? Answered
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).