There was a sonic boom explosion of noise from the radio / speakers followed by very loud static. I would estimate the db level to be 150 plus. Left my ears ringing for hours followed by aching and there has to be some permanent damage. I had driven the truck for 45 minutes. Using radio on about level 5 when I parked turned the vehicle off and exited. After a 90 minute appointment I reentered the pickup and when I pressed start the explosion of noise happened. The level was so intense and loud I was temporarily disoriented and confused. I did not know if there was a nearby explosion, if my windows were shattered, if I was ok. Probably was only a few seconds and the static as persistent. Loud and I could not get it to stop. I did everything I could to lower or turn the volume down or off. Nothing worked. I was in a parking garage unbuckled and when I got over the speed to initiate the fasten seatbelt warning tones, those tones beginning stopped the static. I continued my trip and have not had another occurrence.