What happens if the polarity of the wire coming from the amplifier is reversed and given to the speaker 1)with filter 2)without filter

 

If it's only one speaker, then nothing happens.

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In a stereo System if you give speaker wires as you mentioned above with or without filters the sound may be get decrease (noticeable).So it is better connect them + to + & - to -.

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Are you talking about connecting the phases of a woofer and a tweeter in a speaker system that has a passive crossover network (filter)?

If the crossover network is two even-order Butterworth filters then if the speakers are in phase there will be a notch at the crossover frequency.

If the speakers have opposite phase then there will be a +3dB boost at the crossover frequency.

Use a Linkwitz-Riley crossover network and the response will be flat when the network has two even-order filters and the speakers are connected with opposite phase.

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Uncle $crooge

 

It is not clear if prasannan82 is talking about two speakers in the same box or stereo speakers. AudioGuru covered the tweeter/woofer question.

If we are talking stereo; reversing the phase will kill the base response. The high end will be OK. At 100hz in a normal sized living room the two speakers will cancel out (subtract). At 1khz the phase does a 360 every foot. If you are 6 inches closer to the right than the left speaker then you have reversed phase. Your ear deals with high frequency phase very well. It happens all the time. Walking around the room will cause many high end phase reversals.

 

One time I heard an FM station broadcast stereo music out-of-phase.
It sounded like the bass frequencies were missing so I switched to mono and nearly the entire signal disappeared.

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