Hi, I have an xbox 360 with HDMI output. Connecting the XBOX directly to the Sammy s4253 via hdmi and then connecting the Coax digial output from the Sammy to my Onkyo HT reciever. This does not produce a Dolby digital signal. Same config using my OTA Antenna does produce a Dolby Digital signal. Does the sammy not pass thru digial audio?