Subwoofer problem

[GenesisCoupe]

So I'm having a problem with my head unit and subwoofer. I just recently installed my subwoofer that has a built in amp with it. My head unit is a Pioneer DMH-1500NEX.
For some reason when I adjust the crossover (frequencies) on the rear speakers, it's adjusting the subwoofer too. While I'm on the rear speaker frequencies and adjusting them, I can make the subwoofer very loud but the rear speakers bass is too much and causes distortion. When I go to the subwoofer settings and adjust the frequencies it doesn't do anything. Need help.

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[1aespinoza 10+ year member]

Need help

It seems you connected the amp's RCAs to the radio's rear RCA output instead of the subwoofer RCA output.

 

[Jonnyswboy]

Does the subwoofer amp have a low pass filter?

 

[Buck 5,000+ posts]

Does your car have a factory amplified system where the amplifier isn't part of the radio?

How is your radio sending signal to your amp? RCA's from radio or line converter off speaker wires?