Simaudio Moon Nova vs. Simaudio CD5.3X

I think you're right Jrw40. The Sim website states it as having "optional balanced analog audio outputs" (XLR's), hence the X designation, but doesn't refer to it as being a "fully balanced differential design" (whatever that means) as in the Supernova/Andromeda models.

Could you please explain, without getting too technical?

im unsure if the 5.3 is a fully balanced unit, if it is then yes its money well spent. if its just an option for xlr cables , then not so much.