Installed sub and amp now get crackling in other speakers

[paperinacup 10+ year member]

I have a 2012 Camry SE with Nav no JBL. I installed a JBL amp and used T-taps on the rear speakers and ran straight to the amp. Anytime both sides are plugged in the amp I get a crackling noise in all the other speakers at high volumes. If I just leave one hooked up everything is fine. Used rear seat bolt as ground which I believe is a good ground. Any ideas?

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[Ridinhi 5,000+ posts]

recheck ground(make sure its on bare metal), check your rca's as well, and make sure no speaker wires touching

 

[Louisiana_CRX 5,000+ posts]

The amp is probably too much power for the factory speakers...set you hp crossover at about 100hz and listen

 

[knil]

let me see if I understand how you have this setup. I assume you have used t-tapes on the rear speaker connctions and used this to feed the high speaker inputs on your amp you are using to power the sub. IT also sounds like you have left factory rear speakers hooked up to the wires that you have T-tapped for your JBL amp inputs. If this is the case, then that parallel connection you have created is causing havic with your rear factory rear speakers. You will need to disconnect the rear factory speakers completely and if I were you, I would remove those T-Taps and splice into those rear speaker wires (you can do this without having to cut the factory speaker plugs off if you are worried about preserving them, just leave them disconnected). If you want rear speakers back, your best bet is running a second amp off the RCA outputs of your JBL (if it has them) or using a line out converter and using y-cables to split the RCA outputs between the two amps. Hope this helps, I still may not understand how you have your current system set up though.