Much has been made over the impedance of BNC versus RCA connectors. In my system, an RCA terminated digital cable with so called 75 ohm RCA/BNC Monster adaptors sounded better than 2 BNC terminated cables.
So to me, the issue of what will provide the best sound is not all that clear cut to me. I suspect it depends on the available terminations and design details of each unit, The Monsters adaptors do sound better than the other adaptors I tried (crappy nickel?). Also, the more more metal mass, the longer the terminations may take to settle in. I find XLR, binding posts and BNCs all seem to take longer than RCA.
So to me, the issue of what will provide the best sound is not all that clear cut to me. I suspect it depends on the available terminations and design details of each unit, The Monsters adaptors do sound better than the other adaptors I tried (crappy nickel?). Also, the more more metal mass, the longer the terminations may take to settle in. I find XLR, binding posts and BNCs all seem to take longer than RCA.