I own the crown xls-602, did the research and found out about the special cable you need to run it bridged. Went down to the local music and talked to the guy there, he said that he couldnt understand why you would need to change the polarity for a bass amp. He explained the reasoning behind using it for a PA, but said that I should be fine just running the two 1/4 cables out of my preamp, to the two mic inputs on the poweramp. I questioned it in my head, and thought I would throw the question out here. Why do you need to change the polarity? And what problems could you run into if you dont? And finally, if I do need to change the polarity, do I need a "Y" cable, or is just changing one of the two cables I am currently using? Thanks guys!