[kyouens]

Whether it will work seamlessly may depend on the receiver, but I have a Chromecast plugged into an HDMI port on my Yamaha unit. (Note, there is nothing plugged into the HDMI out port on the receiver.) This setup works flawlessly for streaming audio throughout my house. Some people say they had to use an HDMI audio extractor to achieve this, but that was not necessary in my case.

[milkytoast]

Yeah, similar setup here - I've plugged mine into the first HDMI port on my Onkyo receiver (http://amzn.com/B0077V88V8), and everything works fine. Audio through the reciever, no TV on - plus I get the automatic input switching thing that Chromecast does (seems to just go to the first HDMI port on the receiver, not the actual one it was plugged into). Pretty nice.