NHT M-60 Xd Owner's Manual page 6

M-60Xd SPEAKER CONNECTIONS
The M-60 Xd system comes with a pair of 25' long 4-conductor speaker wires to connect the XdA to
M-60 Xd speakers. Each end of the wires is pre-terminated with a quad banana plug. These banana
plugs are lettered A, B, C, D to indicate the correct polarity for installation on the XdA and M-60 Xd
end. Simply plug the wire in at each end observing the correct polarity.