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! from the above posts i understood that a capacitor removes DC offset (centers waveform to 0V) so the signal swings positive (as before..) and now it's able to swing to negative...
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.