I am due to have HD installed on Thursday, with much dread as a matter of fact after reading the problems some are having), I intend to use the coaxial connection from the HD box to my Cable/sat Coax In on my Onkyo 606. I have been in a friends house to familiarize myself with the menu but am unable to see a specific setting to enable the coaxial output to 'dolby digital', while there is such a setting for the optical out. Please can anyone tell me if there is such a setting or does the setting for the optical out send a 5.1 signal through the coaxial? Maybe it is always active, OI would, like to know before the installation so I can connect it all up while the engineer is there to test everything. thanks, hope someone can advise.