Speaker Noise

[lkv0315]

Hello all! Just got done doing a full audio system overhaul alongside my previously installed Kenwood DNX893S with some Infinity Kappas, Polk Subwoofer, Infinity Reference Series Amp and an MXT sub amp. After driving with it for a few days I noticed the noise that occurs both when music is or isn’t playing, is unacceptable.

Here’s my symptom list so far:
• lots of noise in the system, no matter the volume (static sound)

• an overpowering buzzing sound that occurs under three situations; having the car in reverse, pushing the brake pedal, turning the headlight switch to anything but off.

• very strange (possibly unrelated) short blip of the red battery indicator light (probably like half a second) every time you switch from gear to gear


So far the following things I have tried with little success (just to expedite the process and avoid wasting your time giving me things I’ve already done):
• Ground Loop isolators on all three sets of RCA’s (it helped but not enough for me to consider successful)

•grounding head unit to the same ground as the amps (which is the spot where the ground battery lead is connected to the body)

•turning my speaker amp gain down (noise goes down with gain, but to make it go away you have to have the gain on minimum, which why even have an amp then...)

Yesterday, I ordered an Antenna Ground loop isolator, since my head unit refuses to turn on unless the antenna is plugged in (so I’m assuming it’s trying to ground through it). Also saw something recommending ferrite cores, either with wire wound around it or as I can find on the internet ferrite cores that clip onto the wire. I didn’t order them yet though because I have no idea what they would fix, if they would help and how I would install/use them.

Finally I’m asking here because I think it’s a bit odd it’s behaving based on certain vehicle functions, and I’m thinking it’s something to do with the wiring of the car itself. Thanks in advance for any help!


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