Yes the body material is layers of carbon fiber.....and its reported the resonance frequency of carbon material is out of the audible frequency range. Its easy to detect just how quiet it tracks, almost as if it wasn't in the groove. A stand out for me is how fluid and at ease things are moving from quiet passages to a complex one's, never a rough transition it just flows! Another thing I find is it doesn't favor a particular or one freq as so many cartridges do......the highs are not pushed way out front nor the bottom end is covering up the mids and highs, its easy to move about and dial in on one or all the performers. I think lot's of attention was directed towards the dynamic range of the Harmony.....Having set the harmony up several times you do need to be precise in its set up.