hi guys. i have bought airtel dth hd recently... unfortunately there is no 5.1 sound through hdmi to my onkyo avr. gives just stereo.. i read some posts here advising to connect through optical or coaxial.. pls tell me which one is better... my doubt is as there is already stereo sound passing through hdmi, will there be any weird(echoing) sound produced due to 2 sources(hdmi and optical)... i'm not a techie in all these stuffs

so pls clarify...
also my airtel hd gives pathetic signal quality - just around 40 to 50%.strength is fine though. is anyone else facing this?