What do you mean by "sound processor"? Is that a stereo or a receiver? If you can stream to it - that would be a major feature and in the manual. I'd suspect it would have a built-in DLNA client
and a network connection. Lacking a network port, I think not. Obviously, if you have some device that has an HDMI output and you can get it to put sound down that cable, then a normal receiver will play it back. But you didn't want to run an ethernet cable through the walls ... so I assumed you didn't want to run a much thicker HDMI cable either.