Try putting the end marked Load into the preamp. You should really try it both ways, it will not hurt anything, and will probably sound better one direction or the other.
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Herman is right. The "source" end would always be towards the origin of the signal while the "load" would be flowing towards the speakers. Chances are, Bob Crump has built in a telescoping ground into this cable. This will almost always work best as directed unless something is really goofy with the system. Sean