In order to have nice short cables I made one from a couple of speakon connectors and a 13cm piece of 12 gage speaker wire. The clerk at the music store said that when making a cable i should use only the centre terminals of the connector and skip the other two. I inquired about the polarity of the two centre terminals and he said that it didnt matter what was lead or ground. He didnt seem all that sure of himself. What's your opinion? If its hooked up wrong am I going to fry my gear?