Loving my connect and turntable (Denon SB-400). The turntable has a built in switchable pre-amp and the connecting RCA lines have a third ground wire attached to their run, to run from the turn table to an external amp (according to the turntable instructions).

anyone know - If I’m using the built in pre-amp do I need to ground the turn table? 
 

if I still do need to ground it, given the connect does not have a ground, what are the best options?

these maybe are more questions about the turntable, but hoping any connect experts might be able to help