Question JBL Subwoofer going "crazy"

Dubkiss

Prominent
Jan 26, 2021
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Hi
I own a car with a JBL subwoofer, recently 1 cable was weak and i cut him little bit and plug him back, but now the subwoofer doing some sounds, something similiar to heart beating, what did i do wrong ?, Less volume is on radio more beating comes from it.
What to do now?
 

Dubkiss

Prominent
Jan 26, 2021
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2
545
3
My brother helped me with it because it was his car, it was doing that noise because i connnect a cable from amplifier to amplifier. But thanks for help
 
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