I used to have Sonos (Bluetooth speakers) set up around the house, and set up rooms so I could okay various music on different parts of the house or all of it.. and used a tablet which was on display that controlled the system via Spotify
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Does sound like a good use for them to be fair!
Guess I'm old school, I've run speaker wire throughout the house with a commercial amp which has zone control for each room & the garden. Couldn't be dealing with syncing Bluetooth throughout and having one loose signal
Did take me weeks to install and a lot of repairing plasterboard though!
tablets, for the same reason mentioned previously. too awkward!