Very Little Sound Sc300 Help

[scshinobi]

im sorry if this is a double post but i looked a little and saw a little on the topic im guessing my amp went out but the story is i was taking pictures all audio worked fine and then i disconnected my headlights to get my fog lights on alone then i went in the car to drive to a different spot and no sound just static so i turn it up and i can barley hear the music mostly static but very little music this is for all am fm cd and tape all lights work everything is fine just the sound output if it is the amp any idea how much a new oem one would cost for a 1999 sc300? i checked the fuses under by the brake pedal and under the hood all seem to be fine i cant seem to find the amp anyone help where that is located also?