The ground and shield wires are all connected together in the black junction box. So my question is, all I have to do for a balanced connection is to run the tonearm ground wire to pin 1, along with the cartridge positive and ground wires to pin 2 & 3 to get a balanced connection?Yes.
Does it matter that the shield wires between the black box and the RCA connectors don't connect to the existing RCA connectors?What do you mean by this? Could you restate it?