how to connect chromecast to hifi system
A key difference here is that the Chromecast Audio does not plug into an HDMI slot at the back of your TV. It is designed to plug into your audio inputs: 3.5mm (cable included), RCA and optical.
The premise here is essentially the same as the other Chromecasts. The device connects to your wi-fi network. It streams directly from the internet, and is controlled by smartphones, tablets and computers. A key difference here is that the Chromecast Audio does not plug into an HDMI slot at the back of your TV.