This is really weird so here goes ....

Every time an ambulance, police car, or fire truck comes down the road with their sirens on and they get about a football field away from me and I have my radio on I hear a deep loud bass tone that sounds just like their sirens but in low bass coming from my trucks speakers.

Does anyone else's truck do this?

I'm beginning to think its some kind of safety feature so you can't say you didn't hear them coming, because it's blarring (sp?) through my speakers.

Has someone installed something in my truck that mimics their sirens but in a bass sound.

Thanks!

Nitrox