Problem with my head unit. Popping sound...

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how do you have the headunit powered and grounded?
The power is spliced into my 4gauge that runs to my trunk. The ground is ran to small self tapping screw directly to the body. (All paint scraped away.)

I have just been reading about this everywhere online and it sounds to me like the head unit just can't handle the 2 ohm impedance of these speakers.

 
The power is spliced into my 4gauge that runs to my trunk. The ground is ran to small self tapping screw directly to the body. (All paint scraped away.)
I have just been reading about this everywhere online and it sounds to me like the head unit just can't handle the 2 ohm impedance of these speakers.
Try a 4 ohm speaker.

 
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