I just installed new 6.5in kicker speakers in my door. At high volume I'm getting a loud hiss noise from the speakers. It occurs on aux once the volume gets up to about 25, and also in USB mode all the time. As soon as I unplug my phone during USB mode the hiss goes away. What do you guys think my issue is? And no the hiss doesn't change pitch or get louder as I accelerate and decellerate. Also I hooked up my rear 6x4 pillar speakers to see if they hiss too, and they do. Very confused about this.. any help is appreciated. My antenna is not hooked up because at the time I didn't have an adapter