The G35 I got lived its whole life in Texas(heat and warmth), I just brought it back home to TN(temps in the 20's and teens). So I started the car this morning and immediately there was a loud popping, feedback type sound from all the speakers even with the volume turned down. I hit the power button on the stereo and it got a lot louder(sounded like feedback from an amp). After about 30 seconds it went away and the sound was fine, any ideas?

 

nobody? i took a video this morning. you can hear the loud feedback/thump sound followed by the little firecracker popping sound. it's much louder in person