Playing my Teac CD-P650 CD player with an optical (no coax) out that I am not able to use. I have one optical input on the RZ50 and that is already connected to my TV for antenna sound (Fire TV for everything else on TV). Stands to reason that an optical input would be a superior connection than an RCA input. But I am wondering, is it decipherable enough to make enough of a difference? Playing my Gold DCC Beach Boys Endless Summer CD at the moment in honor of Brian Wilson dying yesterday.