I have added an additional receiver to my home theater for my new speakers in the patio. My question is I have the Explorer 8000HD cable box connected to my intial receiver via digital cable (coax). Can I use the rca audio inputs from the 8000HD for the second receiver to provide sound to the patio speakers? If I can, does the audio signal go to both audio connections (digital coax & RCA) at the same time, in other words, can I hear all the speakers from both receivers at once. Thanks