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In August 2020, Sony introduced the WH-1000XM4, the fourth-generation model in its 1000X wireless noise-cancelling headphone line. It carried over the core of the WH-1000XM3 and added several features. Noise cancelling ran on Sony’s HD Noise Cancelling Processor QN1, paired with a Bluetooth audio system-on-chip that adjusted to music and ambient noise more than 700 […]