I have purchased the B&K Ref 50 and AV125.7 amplifier and am awaiting their arrival. Both have XLR connections and I would like to use them. What is the difference between the $100.00 plus XLR cables that are "audio" interconnects and the $15.00 to $30.00 XLR microphone cables? The mic cables seem like they would be built to a high standard as most are professional use. The price difference makes me believe that the "audio" label is being used to charge more. Are the two cables the same? Any insight would be appreciated.