audioguru said:A speaker uses an AC signal that keeps changing its polarity. If a polarized capacitor is used in a speaker's crossover network then the reversed polarity of the signal for half of each cycle would ruin it. So NP (non-polarized) capacitors are used.
i was afraid that this is the answer..i'm saying that because it is confusing!
when we connect two devices together and their inputs/outputs have capling capacitors the device that accepts the input signal should have problem because most of the time...these capacitors are polarized.