Bright Light ! Huh ? How about taking a look at the path of your intercoonects and power cords under bright lights or a high beam flashlight. Are they really traveling in a smooth untangeled path. How about that spade you are convinced is attached properly on the back of your amp when you peek back their in dim light. Take another look under the high beams. Could it be that giant power cord snake you added 3 months ago gave a little tug to the speaker cable. Boys , get the high beams, as we get older we lazy eyes. Every time my system sounds lifeless or bright or off or whatever, I also ponder and seek some obtuse reason why. And then 9 times out of 10 I find its a loose spade , a tangled interconnect, a power cord laying its venom all over an interconnect. And its all because of overlooking the simple solution . See the light brothers !!!