Yup, SB13-Ultra doesn't do bloated exaggerated bass, and its driver is a beast. By the OP's own words....movies ok, music the bass is non existent. Keep in mind with music, the content below 80 hz is fairly low, unless your listening to pipe organ, double bass, tuba, or synthesizer.
Your Ultra cannot reproduce what is not there. Maybe you'd be happier with another Cerwin Vega instead