When using more than one inductor in a crossover the electro magnetic fields of the inductors can interfere with each other causing an unpleasant result. Using an inductor aka. 100 Diy Build 2 Way Hifi Passive Crossover 1pcs 0 8mm 0 25mh Audio Amplifier Speaker Crossover Inductor My Crossover Design Is Complete Software Engineering Ideally the inductor should have very low dc. What does an inductor do in a crossover . A coil or choke in series with a speaker will block higher frequencies while having little effect on the lower bass frequencies. Band pass crossovers are a combination of the previous. Inductors are the biggest attention getters in the passive crossover and for good reason. Capacitors are used in high pass crossovers because they cut out the low frequencies. The inductor is a wire shaped so that the magnetic field will be much st...