You cannot convert the cable since standard cable has only a
single lead plus the shield and balanced cable requires, at least, 2 signal leads (+ and -) and a ground lead. While you can add a transformer at each end to connect your cable to balanced sources and loads, you will not have a balanced connection.
single lead plus the shield and balanced cable requires, at least, 2 signal leads (+ and -) and a ground lead. While you can add a transformer at each end to connect your cable to balanced sources and loads, you will not have a balanced connection.