Try audio sanctuary
Audio Sanctuary, Harrods. Hi end headphones looks amazing but I have never been, it would be a bit of an adventure out of the city though.
London it’s the near city for me to explore audio. Audio santictuary is the best by far. Penney it’s the best seller, cool guy, very correct and helpful. He has no BS try to selling to you
Unfortunately never had the time. Spent a nice afternoon in Notting Hill though.
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