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Gotta test segment by segment.
1) Speakers test: Do you have any other music source you can hook up to the 6X9s - in order to test them independent from the car system?
2) If OK, then run plain exposed wire direct from the head unit to the speakers.
3) If OK, then it's time to try a different head unit, or at least recheck the connections for ground, etc.
I find it hard to believe that a speaker rated for 60 watts RMS can be blown by any headunit which even while peaking & clipping could only manage around 50. That would require an extended play time at a severely clipped level.
As a result, I'm guessing you have encountered a wiring problem, a speaker defect, or the head unit output is screwing up - see 1, 2, 3 above.
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