All owners with a bone stock Denali or Escalade. On your LUX radios when you fade to the rear completely or move the balance all the way to the right and left - does the center sub turn off completely? I did the LUX amp upgrade on my 06 Yukon and noticed this while playing around with it. I messaged another member that did the same conversion and his does the same, so maybe it is how the amp works. Just curious to see if an original unmolested system does the same. Thanks.