T-D (Theater Dimensional) must have the virtualizer on as well according to manual.\n\nOne thing I stumbled on that was confusing is that DD+ mode said DD+ 5.1 to DD+ 7.1 in the pop up info window. I would had thought it would had said DD+ 5.1 to DD+ 5.1 as Dolby Audio surround said DD+ 5.1 to Dolby Audio Surround 7.1. So are they both converting to 7.1?? I wouldnt think so but the on screen pop up info says it is.\n\nMaybe info pop up is just saying its a 7.1 system and not saying it's converting? If so, then what tells you that it is converting to 7.1?\n\nIm confused now.\n\n\nYep, I have 7.1 Surround back Channel sound coming out with DD+ 5.1 input and Direct DD+ 5.1 input, along with Dolby Surround DD+ 5.1 input.\n\nOutput says DD+ 7.1\n\nSwitching my speaker configuration to 5.1 or 5.1.2 leaves no sound coming out of surround back channels and info screen says output DD+ 5.1.\n\nDont know why I have surround back channel sound 7.1 when manual says I should only have 5.1 sound with an input of DD+ 5.1.\n\nObviously the menu says its outputting DD+ 7.1 with a DD+ 5.1 input so its doing what it says.\n\nWonder why?\n\nNo difference between between DD+ listening mode or Dolby surround listening unless you turn speaker virtualizer on where DD+ doesnt use it and Dolby Surround does use it.