This is my first purchase from KLH. The product designation "pure beryllium" appealed to me. Yes, the two 50mm drivers are made of pure beryllium. Out of curiosity, I placed an order to buy. Before I had time to listen to it for half an hour I thought I did the right thing. I was amazed that the headphones perform very well in high, mid and low frequencies with a fairly satisfying soundstage. Highly recommended to all music lovers.
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