Tellurium Q Black was our first cable and we knew we were on to something special when we took the prototypes to various dealers for their comments and input. One in particular would not believe that it could match the somewhat thicker more expensive cable in his demonstration system. We sat down and listened to some of his familiar music tracks, then we swapped the cable for Tellurium Q Black. He sat forward, looked at us and quite seriously asked what else we had done to his system while we were changing the cables over. It was only when he swapped the cables himself a couple of times he believed the evidence of his ears.