Working on a kenwood kac-921

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So I have an issue, well I think it is I'm using the amp to play bass I'm using a bumper in a ported box tuned to 40hz it maximum rating is 420rms and the amplifier is 160 based on research and when I play music loudly I hear like the voice coil is hitting the back of the magnet could it be that the amplifier is outputting more power than the speaker can handle?


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