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The cracking sound is like loose wire. When you have the HU turn with AUX (for example) and you touch the audio in (of the aux), you get that sound. The same cracking sound if you do it to TV, home Amp.
The reason I did 2 separate feed is to issolate the source of the cracking sound. I do have engine whine too but not at the level that make me stop the car and correct the darn thing.
Ground loop isolator will NOT work in most case. It is a bandage solution but sometime it work. Try CAT 5 or 6 cable. It's the best.
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