Thanx for the inputs..Chances are that your home theatre is using pro-logic to resolve the 2 channel audio into pseudo 5.1 audio, you can check this if u are getting the same sound in the front and rear speaker. So when the signal being sent by your HT from the tv is directly 5.1 then your HT is only receiving the surround component from your front left and right speakers while the main dialogue sound is always directed through the center speaker.
How have you connected the STB to your home theater? Analogue connection or digital optical out? Check on the HT if Pro-logic is turned on. You will notice the difference between true surround where all 5.1 channels receive individual sound stream and pseudo surround.
I have checked by using optical cable from Bing+ box...There is no prologic option in HT...There is a option named Enhanced audio...If I switch off the audio becomes very very low..In TV it's fine...Only in Bing box...
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