NEC POWERMATE P - SERVICE MANUAL 1996 Service And Reference Manual page 43

2-4 Setup and Operation
Figure Section 2-4 Connecting the left speaker cable
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Attach the Y-cable as follows (see Figure Section 2-5).
Insert the red connector into the red jack marked "RIGHT LINE IN" on
the back of the right speaker.
Insert the white connector into the white jack marked "LEFT LINE IN" on
the back of the right speaker.
Insert the other end of the cable into the Line Out jack on the rear of the
system unit.