Not too good experience with Kef LS50W here.
Bought the pair in summer 2018. The same winter, they started having problems, left one switching off every 5 minutes after listening for 20 minutes.
Service had no idea what the issue is, replaced the motherboard. As it was warranty, this repair was free.
Fast forward to summer 2021 (warranty over), right speaker started having issues when trying to switch it on (blinking power button, which according to the user manual means system error).
By that time there was no official distributor in Lithuania, so I had to send the speakers for repair to Latvia, where they diagnosed it as motherboard issue.
Getting new motherboard from China took insane amount of time, and they are sending the speakers to me only now in spring 2022(!). They say the motherboard alone was 750$ without shipping/tax, bringing a total after tax bill to 1100$!
Should have just bought new speakers…
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