on my jvc HU when I have my ipod in the aux port it is much quieter than when it is a cd. But, also at the same volume on the HU when it is quieter on the iPod, the clipping indicator on my gain knob(AQ) will never light up. When the ipod is in, on most songs I can turn the gain all the way up and sometimes still not even have it blink. Whats going on here? Could it just be the music on the iPod? or is it the device/method of output themselves?