persistent noise since install amp+sub

[dardares]

Hi,

Have an Volkswagen CC 2011, and just install my amplifier(Kenwood KAC-8104D) and a 12 inch subwoofer, on the factory radio(RCD-510)

I've connected two speaker wire from the rear car speaker, and on the other side of the wire, cut it and put RCA cable on the end of it, to connect to the amp. Connected to a 12V switch and fuse box for have the possibility to put the sub on and off.

My problem now, the sub working fine, but have a persistent noise from the rear car speaker. If i unplug one rca cable, all is doing fine, so i've identified which wire create noise.

My question, according the sub play music same if i let only the right RCA cable plugged in, does the sound will be better if i fix the other RCA cable and plug it back again? If i need to fix it and plug it, what the possible cause? Does i need to remove all the car trim again to do again my wire, or it just on the end of the rca cable it may be not ok?

Thank you very much!

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[Jepalan]

Tap both of the rear speaker wires and connect them to the high-level input harness wires on the amp. Don't use the RCA inputs.

Use this...

 

[dardares]

i didn't have this adapter. I've buy my sub and amp used. Use it on my last car many years without any problem whit RCA, but plugged directly on the back of my jobber radio. I think the left rca cable create sort, because when i plug it now, my amp stop work. If i unplug it, all is ok. Does it's necessairy, according have only one sub, and not two, to plug the left and right rca cable, or just only one do the same?Beause if not, i will need to unmount the door again...

Thank for your help!