Myndstream can be easily connected to your Sonos speaker system either by connecting your phone, tablet or computer to the Sonos speaker using an Aux cord to the Line-In port, using Bluetooth or using Airplay.
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Sonos has a guide for Bluetooth here - https://support.sonos.com/en-gb/article/use-bluetooth-on-sonos
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Sonos has a guide for AirPlay here - https://support.sonos.com/en-gb/article/stream-airplay-audio-to-sonos

Sonos has a guide for Line-In here - https://support.sonos.com/en-gb/article/use-line-in-on-sonos

Once you have connected to a Sonos speaker you can group other speakers to play Myndstream on multiple Sonos speakers.

There is a guide for Bluetooth here - https://support.sonos.com/en-gb/article/share-bluetooth-audio-with-your-sonos-system