Just bought this car. Its Great! Other than the radio which lets out this strange hiss every time there is a high treble noise, cymbal crash, or when someone talking uses S or T etc. It is a noise beyond just having the treble set to high and I have tinkered with those settings to try and reduce the noise which is actually louder than the radio volume. Anyone have similar problems, know what causes this, and or how to fix it? I would like to keep the stereo stock and just hook my ipod into a radio frequency for road trips because the speakers seem fine. Otherwise we usually just listen to the radio, but god is it getting annoying! thanks in advance.