When you find the voice come from your speaker is not pure, it might be caused by broken horn.
In this case, you should buy a new horn in same size and connect it wit your speaker. Only by pasting the broking part will not work and there will be no improvement on sound quality.
If there are more than one horns in your speaker, and one of them sounds broken, this is caused by input voltage. In this case, you need a high power transformer.
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