Your tweeter can be blown or your reciever cant handle the power or your wiring can be off or it can be your source.
Play 2 movies and when the sound comes on put your ear to right next to the speakers and if its all speakers doing that its your recievr.
If its one particular speaker out of all your speakers its your speaker with a blown tweeter. Play 2 sources to check if its the source.
Unplug all your speakers then replug it back in and if its doing the same thing, its the tweeter thats blown.