Sennheiser HD 620S review: One-minute review The Sennheiser HD 620S are something of a departure for the existing HD range, which largely consists of open-backed headphones – the preserve of audiophiles who don’t want anything, even the headphones themselves, getting in the way of expansive soundstages and high-fidelity audio.The Sennheiser HD 620S hope to achieve the large, dramatic soundstage of open-backed headphones with a closed-back construction that keeps some of the environment around you shut out – the sonic
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