My stereo just started making a VERY annoying whistling sound during acceleration today. My setup is and Alpine CDA-9807, crossfire and profile amps and crossfire speakers. The stereo has been working fine for the last year and it jsut started making the sound today. Its always present when the stereo is on and the pitch gets higher when I accelerate. The volume of the noise is constant no matter what volume the stereo is on. Anyone know what it is?