What connectors do you have? AFAIK, Audio Research used RCA or BNC coax, XLR (AES/EBU) and an optical connector. I doubt that they have no RCA connectors unless this is a strange variant.
BTW, the coax you are using must have RCA or BNC connectors which is used by many cable manufacturers.
BTW, the coax you are using must have RCA or BNC connectors which is used by many cable manufacturers.