"Sony just quietly liquidated XM4 inventory on Amazon, dropping the price to $198 from the usual $348, and the timing is interesting because both the XM5 and XM6 are on the market at nearly three times this price. Here's the thing though: the technological improvements between these new generations are minimal and most users can't tell the difference in real-world use."
"The core feature that made the XM4 legendary is Sony's Dual Noise Sensor technology which uses microphones on both the outside and inside of each earcup to capture ambient sound. The HD Noise Canceling Processor QN1 analyzes this audio data over 700 times per second and generates inverse sound waves that cancel out unwanted noise. This isn't passive isolation from thick padding, though the earcups do provide physical noise blocking too:"
Sony discounted WH-1000XM4 headphones on Amazon to $198 from $348, moving over 10,000 units during the sale. The XM4 retains industry-leading active noise cancellation, 30-hour battery life, multipoint Bluetooth connection, and premium sound quality comparable to later XM5 and XM6 models in real-world use. Dual Noise Sensor microphones and the HD Noise Canceling Processor QN1 analyze ambient audio hundreds of times per second to produce inverse sound waves that cancel low-frequency rumble. An app provides 20 additional noise-cancellation levels and 20 ambient-sound levels. Quick Attention lets ambient audio in instantly when needed.
Read at Kotaku
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