Perhaps he is asking how to wire a 4 way with 2 amps that are bridged? Or you have 4 pole speaker wires and full range speakers? Full range speakers on NL4's only need 2 wires.. done as Shane said...make sure to mark the amp end or speaker end for identification so you won't reverse the cable.. as Shane also said a better way would be to get a couple NL4 jacks and wire the amps to the standard NL4 cables.
To better answer your question lets look at a NL4 Bi-amp setup using 2 Bridged amps, this would require 2 panel NL4 jacks since the amps in bridged uses only 1+ and 2+.
Low amp1, 1+ to NL4 jack 1+
Low amp1, 2+ to NL4 jack 1-
Hi amp2, 1+ to NL4 jack 2+
Hi amp2, 2- to NL4 jack 2-
Note: in the above you can use the NL4 jack out that shows the 1+/ 2+(typically channel 1 or A, or the 2 red binding posts, noting that polarity is important 1+ goes to 1+ 2+ goes to 1-.
The speakon standard cable then would be (could be ANY combination... but) you specified red and Black, so red would be 1+, and black would be 1-.... yellow would be 2+, and white would be 2- (where white and black denote ground.. which is kind of a standard...not really but oh well)
this would be for one speaker...
A more typical setup might be bridged lows and stereo/dual mono highs:
Low amp1 bridged 1+ to NL4 panel jack 1+
Low amp1 2+ to NL4 " " 1-
High amp2 stereo 1+ to NL4 " " 2+
High amp2 stereo 1- to NL4 " " 2-
The other bridged amp would feed a second NL4 the same as Low amp1 and the second channel of the second NL4 would feed like this:
High amp2 stereo 2+ to NL4 " " 2+
High amp2 stereo 2- to NL4 " " 2-