Sonos is a HiFi speaker system that works together on a dedicated wireless network. It can play music from your own library, or from several other online sources including Pandora, Spotify, Amazon Music, Google Play, TuneIn, SiriusXM, Songza, and more. You can also stream audio to it from any of your devices. Sonos speakers are easy to set up also -- just connect it to your router and control it wirelessly with the free Sonos controller apps for Android, iOS, Mac, and PC.
The great thing about Sonos is its flexibility. You don't have to buy a whole system at once -- you can build it up one speaker at a time. The Play:1 speaker is a compact speaker with two drivers for $199, the Play:3 has three drivers for $299, and the Play:5 is the biggest with five drivers for $399. You could put one speaker in each room and have the same thing playing on all of them, or you can play different things in each room. You can even pair two speakers for stereo sound. These speakers aren't cheap, but the way it works together on its separate, dedicated network is unrivaled and has minimal lag.
Sonos has wireless components to make your home theater or stereo controllable with the Sonos app. The Connect:AMP for $499 is an amplifier that connects to your existing speakers. For $349, you can get the Connect without the amplifier. Lastly, the Bridge for $49 will allow your other Sonos music players to work wirelessly. It also will extend the range of your existing network, if your speakers are far apart from one another.
Sonos also has a home theater solution, with its Playbar TV soundbar and SUB subwoofer.