I am also facing some audio issue in d2h......
Their HD sound is excellent....
but in SD uneven audio volumes in channels...
and its too bad and its too low even I reached my TV volume to 80 and above...
But when I connected my same lcd tv with airtel SD box for same settings. The SD sound quality is too good and excellent effects. Even at low TV volumes like 20-25 the SD sound quality is too good.......I don't have Airtel HD box so I don't know about Airtel HD sound.
D2h must do something to eradicate this uneven low audio problem