healme4 years ago000What is the difference between this and the HX6511/22 model, which has the same specifications but is almost twice as expensive?Show in original language (German)alby_bg384 years ago • purchased this product000purchased this product Helpful answerHX 6511/22 is new with sound vibrations 62000/min. Otherwise classic model HX 6511 is with 31000/min. No idea why it is sold twice as expensive.Show in original language (German)Comment1 comment