(Note: this review is for the generation of headphones immediately preceding the current RS1i.)   Grados are the headphone equivalent of old British sitcoms – you either get them, or you don’t. Fortunately, I get them… and my favorites so far are the Grado RS1.   I own what are known in these parts as “Buttonless RS1s.” These headphones are sort of an intermediate step between the classic RS1s with buttons on the grills and today’s RS1i model. They have beautiful dark wood cups and appear to suffer from none of the casualness of build that...