I don't think there is anything wrong with the sub. It has to be a sesetting in the receiver, I'm thinking. You may need to get better components. My quintet synergy satellite system bottoms out at 120hz and my receiver goespecially from 100hz to 150hz on the cross over. I am on the verge of buying the reference center that goes down to 88hz so I don't lose any sound be tween the sub and the rest of my system.