Its not the speaker, or speakers. Most likely the amp or the headunit. But indeed, this should be investigated step by step. First check the speakers (ie take em out and do a test on them). Then replace the amp and headunit.
Not your problem if that takes a whole week and a few hundred usd.
A company can be as good or bad as the service they offer. In this case, unfortunately a very bad one ... good luck !
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