Mid range speakers cutting out at high volume

[caaaa03542]

I have a PRV Amp (QS800.4) Hooked up to my PRV chuchero(loudspeaker) and it cuts out every single time when i put it past 12 volume (my radio maxes out at 40). I This exact amp and speaker on a different car with a aftermarket radio and it works perfectly fine, no cutting out .
What can possibly be the issue?
Im not a expert but my wiring is fairly neat and i have solid connections.
I am using a Line output converter since i have a stock radio but i doubt that can be the issue.....
I also have a subwoofer hooked up and that works fine with no interference.
(2020 honda accord)

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[mahc 10+ year member]

Are both amps grounded at the same spot? Get a multimeter in the power terminals of that amp and see if there is voltage fluctuations.

 

[caaaa03542]

Are both amps grounded at the same spot? Get a multimeter in the power terminals of that amp and see if there is voltage fluctuations.

Yes, i have it grounded and the sub amp and the speaker amp are connected to it through a distribution block, sub has no ground noise but the speaker amp does regardless of where the ground is placed....
I will try out the multimeter !