Around back, two single-ended RCA plugs sit above a parallel pair of XLR balanced output connectors. A small graphic next to the XLR explains the wiring layout. In what Marantz amusingly calls the "USA System," pin 2 is cold, pin 3 hot.
The SA-1 also ships with pin 2 hot and pin 3 cold—the actual US standard—but that's referred to as the "European System"! Ya gotta chuckle—it's not quite a global village yet.