Thank you for the note.
The woofer in one of the speaker is not fully functional. We hear the sound little muffled.
The dealer suggested changing the woofer. I will search for used ones. I am hoping someone here may have a something in spare.
Thanks again.
So we really don't know what is the matter with that speaker. Did the dealer do any tests on the speaker, or just make this suggestion out of his thick neck supporting a neurone and synapse deficient brain?
Do you even know it is the speaker, or the electronics? If you don't know then swap the speakers over. If the fault moves with the speaker then it is the speaker. If the muffled sound stays on the same side then your electronics are at fault and the speaker blameless.
If the sound is muffled more often that not it is the tweeter that fails. If you put your ear to that speaker do you hear any sound from the tweeter?
If the surround of the woofer in that speaker looks alright it is. So then that woofer if it is the problem would have to have a voice coil/suspension problem. There aren't any other parts.
Now this is easy to test for.
Carefully put two fingers either side of the dust cap and gently push the cone in and out. See if you feel any grittiness. It should be perfectly smooth with no noise and no roughness.
If you feel roughness and or hear grating, then put the speaker on its back and see if the roughness/grating goes away. If it does then the suspension has gravitational sag causing gap rub. If that is the case, then unscrew the woofer and turn it though 180 degrees and remount it. This reverses the gravitational pull and often will correct this problem. If this is the case do the other woofer so it does not get the same problem.
If it is the speaker that is at fault, and the woofer passes the tweeter/gap rub test, then the crossover likely has a problem which can occur in older speakers.
In that case remove and take really good pictures and post them here. I will then tell you how to fault find/repair the crossover. They are pretty simple.
Report back here and be sure to tell us why and how the dealer came to recommend woofer replacement. You don't suggest woofer replacement. You give a direct order based on a firm opinion when you have determined for certain the woofer is the cause of the problem and can not be repaired.