Alternatives for the Sonos multi-room system
Heos multiroom system
Heos has speakers of different sizes. Pair 2 or multiple speakers and spread them throughout the entire house. Via the app, you can control the multi-room system and play music from streaming services like Spotify and Deezer. You can stream via WiFi, but also via Bluetooth. The speakers don't have AirPlay. In addition to regular speakers, Heos also has an AMP that allows you to add passive speakers to your Heos multi-room system. Since Heos has a soundbar and subwoofer too, you can also easily create a home cinema sound setup.
Harman Kardon multiroom system
Are you looking for a stylish multi-room system? Harman Kardon might be suitable for you. Harman Kardon has a wide selection of speakers in all kinds and sizes. The speakers work on their own, as a stereo pair, and in a multi-room setup. Harman Kardon also has larger speakers that you can easily add to your sound setup, like column speakers, soundbars, and subwoofers. The speakers are Google Assistant compatible, which means you can control them with your voice. You can control the speakers from the Google Home app on your smartphone manually too. Some speakers even have touch controls on the casing of the speaker.
Bose multiroom system
You can use Bose speakers on their own, as a stereo pair, or as a multi-room setup. You can connect Bose speakers via WiFi. Music can also be streamed via Bluetooth. Use the Bose app for this on your smarpthone or tablet. Bose has an extension for your sound setup consisting of a soundbar or subwoofer. Note that not all Bose speakers can be connected to each other.