Apple Inc. quietly pushed a firmware update — version 7B21 — to AirPods Pro 3 units on Wednesday, targeting a low-frequency audio tuning issue that had drawn attention in comparative reviews published earlier this week. Multiple audio publications noted that while AirPods Pro 3 excelled in noise cancellation and transparency mode clarity, the earbuds exhibited a measurably thinner bass response when stacked against Bose's QuietComfort Ultra 2 in blind listening tests.
The update, which deploys automatically when AirPods Pro 3 are placed in their charging case near a paired iPhone running iOS 19.3 or later, adjusts the computational audio engine's equalization curve in the 60–250Hz range. Apple has not issued a formal press release, consistent with its standard practice of deploying firmware silently, but the version number appeared in device settings logs shared by users on social media Wednesday morning.
Audio reviewers who had published the original comparative tests began reporting noticeably improved low-end presence within hours of the update propagating. 'The bass shelf is tighter and more present now — closer to what I'd expect from a flagship product at this price point,' wrote one senior reviewer at a major consumer electronics outlet, who had originally rated the Bose unit slightly ahead on sonic balance.
The development highlights intensifying competition in the premium wireless earbuds segment, where Bose's QuietComfort Ultra 2 launch has forced Apple to respond more nimbly to acoustic criticism than it has historically. Analysts note that Apple's ability to alter hardware performance characteristics through firmware gives it a significant post-launch advantage that traditional audio manufacturers are only beginning to replicate.
Bose declined to comment on the update. Apple's product page for AirPods Pro 3 has been updated to reflect the new firmware version, with the company noting 'audio performance improvements' in its brief release notes — language that rarely appears in routine AirPods firmware changelogs.