Are all audio receivers equipped with internal DAC? I have Sony DN1080 with Zone 2 RCA outs. All my input sources use the HDMI inputs on the Sony receiver. But when I try to output to the 2nd zone, I get nothing to my speakers/amp. I have also read that on this receiver the Zone 2 will only play analog audio signals, indicating that there may not be an internal DAC - is this possible? But I also can't get the Bluetooth as source input to output through the Zone 2 RCAs......how is that possible, isn't that an analog signal and what I also read was this is supposed to work for Bluetooth source connection....anyone help?? Many thanks!