I read a post elsewhere that said his Axiom sub auto-on feature did not work well. It would not come on without cranking the receiver levels up very high. I replacement Axiom sub had the same behaviour. He suspected Axiom subs may have issues with their auto-on circuit because he replaced the Sub again with another brand whose auto-on feature worked as it should. Is this something I should be concered about for movies and/or music? Thanks.