Liked me connect my speakers. But had the 6470 (770) to stand for 3 / weeks when the Werbezettelchen came. For 30 more I've done my work and then brought it to me. Amazon took the other mega accommodating without complain 3 days from later. topi. find the 6620 s optical tick more noble than the 6470th reason is the discreet chrome strip on its underside. the other had a small transparent plastic frame round rum. by frame minimally more. am pleased to exchange