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    "headline": "Sonos Unveils Ace Ultra Headphones with Direct System Linking",
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    "prose": "Sonos announced the release of the Ace Ultra headphones priced at $449, which are available for preorder with shipping scheduled for September 29. [^1]\n\nResearchers demonstrated that comparing Large Language Model calibration using global metrics such as Expected Calibration Error and Brier Score is confounded by differences in model accuracy. [^2]\n\nHeadphone Engine 2 includes redesigned Wi-Fi hardware and secure credential storage to allow the headphones to connect directly to and participate in the Sonos system. [^3]\n\nSonos states that the Ace Ultra is its first headphone built on Headphone Engine 2, which allows users to link the device directly to their Sonos system with a press of a button. [^4]\n\nThe Ace Ultra features new Sonos-designed 40-millimeter drivers and upgraded adaptive noise canceling technology. [^5]\n\nThe study found that ranking reversal is frequent, where models favored by raw metrics often cease to be favored once accuracy is controlled. [^6]\n\nThe study proposes an Accuracy-Controlled Evaluation (ACE) framework with three complementary views: Instance-Aligned, Distribution-Aligned, and Candidate-Aligned calibration. [^7]\n\nUsing the ACE framework across multiple benchmarks and model families, the researchers found that calibration advantages reported under raw global metrics weaken substantially after accuracy control. [^8]",
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