If you wanted to make sure, you could test the Neutrik adapter to see if the negative polarity pin is connected to the ground on the RCA adapter. For a transformer coupled output, that should be the correct configuration. You should have the configuration #6 on the following Rane wiring reference:
If you are using the following Neutrik adapter, there is a slight possibility that you may have some ground loop hum (since both pins 1 and 3 are connected to gound)
If you do have ground loop hum, you may need to make your own cable/adapter and lift pin 1 from the RCA ground.