Kicker 43cxa12001 Output trouble possibly.

at speaker terminal 10x.
input is 40hrz ampl. 4v duty. cycle 50.% (same signal i always use)
 

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at speaker terminal 10x.
input is 40hrz ampl. 4v duty. cycle 50.% (same signal i always use)

Please clarify. Are you describing the input signal as 4Vp-p, 40hz?
Is this a sinewave or a squarewave? How does the 50% duty cycle apply?

What is the Rail Voltage? The squarewave drive voltage to the output mosfets will be half the rail voltage, due to 50% Duty Cycle.

A screenshot of the waveform before and after the output coils with and without signal would be helpful.