Why not just call the guy and ask him how he did it?
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The guy you bought it from was likely getting the signal from one channel of the amp. I love Speakon plugs (use a lot of them in pro audio) and recommend the angled ones if the REL is near a wall, and since Neutrik plugs allow for multiple wires it seems silly to be bothering with a 2 line solution. I use 3 parts of a nicely made 4 conductor spiraled (rf rejection) cable that works very well.