I have 3 stereos setup in my house, and these Chromecasts do a decent job over wifi of being able to sync music to them all. There is no escape if I decide to punish the family with sound, or just rock out threw out. I think they're normally $25. $15 today at Adorama. https://www.adorama.com/garuxj42.html?EmailPrice=T I'm trying to figure out a way to need a fourth, but my house isn't that big... hmmm.