No surplus circuits are needed, the output of the cartridge is in fact balanced. It is not referenced to ground, it is floating. The positive pin of the cartridge (typically right is red and left is white) is connected typically to pin 2 of the balanced cable and the negative pin of the cartridge (typically right is green and left is blue) is connected typically to pin 3 of the balanced cable. The ground wire of the balanced cable will be either left floating at the turntable end or connected to a ground terminal on the turntable (VPI has this, I can’t speak for any other turntable brands). At the phono pre-amp end the ground is connected to the ground of the pre-amp. See the image below. I should note that I use the term “typically” to indicate these are the common pin assignments, but you need to verify this is how your cartridge and phono pre-amp are wired. One note on the image below, the ground they show goes to the cartridge, I’ve never seen a ground terminal on the cartridge. The ground will be on the turntable itself.
