According to this article you should be able to do so.
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Hi, thanks for the link but according the the rc360 manual, only analog sources can be output from zone 2 -- it would make sense (I think) that zone 2 = zone 1 should be possible whatever the source(digital or analog) since no additional dac is required, but it seems not to be the case.
Has anyone tried to use speaker level to line level adapters with success? I am thinking of getting one to connect the mains to an amplifier.
What is your digital source?
If you are taking the digital signal out of a disc player into a digital input on the AVR, you might be able to run a second rca cable "alongside" the set up from the disc player's analog out into an analog input on the AVR. The main zone would use the Onkyo's internal DAC and Zone 2 would see the analog output from your disc player's DAC.
Unless there's some issue at the player, or some switching issue, I'd think that this would work.
The digital source is an optical cable with Dolby encoding, but that can be changed to PCM. It comes out of a Logitech Revue, which does not have analog output unfortunately.
I tried various connections and it seems that what can get out of zone 2, when I let zone 2=zone 1, is not as clear cut as analog is ok and digital is not: if I connect an Ipod through USB cable, sound comes out of zone 2. The restriction may come from some software restriction for copy protection of content.