Send it to the cable maker and get it chopped up. I did that long ago with some AudioQuest Volcano cable. A 12 foot cable was chopped into four 3 foot lengths. I was even able to sell them later to TMR.com when I no longer needed them.
+1 to the comment by @yyzsantabarbara . The manufacturer is the best one to help you. In theory, shorter speaker cables are best, because the impedance of the cables influences the sound least. Whether that's audible -- or desirable -- to a given listener in a given system is a different, and entirely subjective, question.
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