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Buzzing as in dirt in the coil gap or buzzing as in panel vibration? Any of the door panel clips that are broken?

Distortion sounds from all speakers

 

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Either phone signal interference (I'v had this b4 it is due to an open or exposed power cable near any kind of signal, either phone or RCA signal) is it constant or does it fluctuate?

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This is constant. It does not change With volume. It does not whine With throttle. It does not matter if I use the head unit or phone. The Amplifiers are Near the battery and the Main Power cable from the battery goes under the one amplifierc But I've tried to lift it up With no change. I think it's either from the amplifier(s), dsp or the speaker cable(s). I just think it's wierd when I get it when I open the left door.

 

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Hmm... Remove your front panel, play around with the headunit, tap it here n there whilst it's on and playing, now an again I get that exact same noise an all I have to do is smack the dash and it goes away, mine is constant aswell. 90% of the time the source of that noise is behind your headunit so check there 1st as wires are often cluttered up behind it, power cable right next to the RCA cables.

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The head unit is basicly loose, but its still Connected to cables. I think I'll og purchase a iso adapter set and try an other head unit to see if the original head unit is the problem. The reason I have not unplugged the radio is because I've heard I can get airbag faulty lamp. although I really want it original. I know there is a loop issue to the head unit. the sound get's less loud when I ground the headunit chassis (although I have not removed the original ground)

 

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Ground the negative of your RCA to the headunit itself... I hear that works, what car your driving?

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Volvo xc70 07model. Thanks for all Your replys, so far. I'll check tomorrow

 

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Dome light interference? Are there any other safety gimmicks that kick in when you open driver's side door?

There is no dome light inside the door. I believe that I get a warning in the display if the door is not shut while I drive. No airbags in the door either.