that happens in my home stez sometimes, you either have speakers that are shit or to much power going to them, well thats what i was told, i fixed mi9ne by turning the amp down... no more sssssssssssssssssssssssshhhhhhh...
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that happens in my home stez sometimes, you either have speakers that are shit or to much power going to them, well thats what i was told, i fixed mi9ne by turning the amp down... no more sssssssssssssssssssssssshhhhhhh...
popping noise when turning on and off usually is because bad grounding. check your ground to see whether its on bare metal
What headunits are being used in both cases?
My money would be on it being you both have Pioneer headunits and have blown the rca tracks in the headunit, hence the popping sound when you turn the headunit on/off and switch between radio and Cd.
What you need to do now is run the RCAs from your amp to your mates CD player in his car....if the noise stays, its the amp, if the noise disappears, its the headunit OR if you are lucky just the RCA cable.
I'd still try the RCAs from your amp to another car.
Noise stays = amp issue (turn on/off circuit)
Noise goes = headunit issue.
Just because you paid someone to do it, doesn't mean its a pro job.
check all the grounding including the HU grounding as well...