The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Hi-Fi Pig's[2] launch report (https://www.hifipig.com/audio-technica-launches-ath-m20xsts-streaming-headset/) states the ATH-M20xSTS StreamSet is 'available to buy from 1 September' at GBP 89 / EUR 99, following Audio-Technica's late-August 2026 unveiling. September 1, 2026 is the on-sale day.
HiFi Pig reports Audio-Technica[1] introduced the ATH-M20xSTS on 7 September 2026, one day ahead of the pin's stored 8 September date.
Notebookcheck states the headset "becomes available globally on September 1," about a week before the pin's stored 8 September date, which may reflect a regional or preorder date rather than general retail availability.
Trusted Reviews' launch report says the ATH-M20xSTS "joins Audio-Technica's[1] StreamSet range as its second model" after the ATH-M50xSTS, builds on the ATH-M20x that "has sold more than two million units", and uses 40mm CCAW voice coil drivers and elliptical earcups.
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