For the past few weeks I've been hearing a scratchy sound playing with the background music during certain TV broadcasts (mostly discovery-like channels). It's almost an eery scratchy gieger counter like sound. It's fitting for the programs I'm watching (Strange Evidence, What in the World, Monsters Inside me), so I'm not sure if there is something wrong with my speakers, or if that's the intended sound.
Is there something I can play to test the sound output to know if it's my speakers crackling or not?
Please can you let us know the model number of the amplifier/cabinet you are referring to ?