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Primarily, we stream directly to them using Spotify connect - so the spotify app on a phone, or computer, or anything just acts as a remote and the speakers handle all the streaming and dac duties. It's as simple as turning them on, hitting play in the app and selecting the LS50s as the output. If Spotify ever open up a 'hifi quality' tier all of my issues would disappear...
For records, I have a Rega phono stage that just plugs in to the back of the master speaker.
I absolutely love pretty much everything about them. They sound really brilliant for everything I listen to regularly - mainly modernish guitar bands, some techno and fair amount of parts in-between.
There's something really great about their simplicity, you just turn them on and away they go. My partner who's not really fussed about hifi I think likes the modern way they just work with Spotify connect from a phone.
The big draw back has been how crap the KEF app is and the lack of something similar to Spotify connect for Tidal - there's no way to control streaming direct to the speakers from the Tidal app, you have to do it via the pretty rubbish KEF app, and for a £2000 hifi it seems a shame to be using the slightly inferior streams from Spotify but we do that a lot because the integration is so much nicer to use.