Sony's mid-2020 over-ear flagship before the XM5. Industry-leading ANC at the time, 30-hour battery, LDAC + DSEE Extreme upscaling, multipoint Bluetooth, touch-pad controls on the right cup. Many users prefer the XM4 over the XM5 for the foldable design and physical fit.
Refurbished pricing in 2026: EUR 140-220 depending on cosmetic grade.
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The most common XM4 failure mode is right-cup pad detachment - check the foam is intact. Pads are user-replaceable at low cost.
Verify firmware via Sony Headphones Connect app - older firmware versions had noticeable static on calls. The fix arrived in 2.5.1+.