The sub should not be making any sounds while it is in standby. When playing music or a movie the light on the back of the sub should be green as well.

You should make an inquiry to the support staff at Axiom regarding a possible problem with the amplifier on the sub. Almost always these types of problems are amp related.

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne