The Phonak Sphere Infinio is a premium behind-the-ear prescription hearing aid released in 2024, earning an A grade and ranking #2 among 34 prescription devices tested by HearAdvisor. At $4,398, it sits at the top of the price spectrum but delivers sound performance to match, particularly for users who struggle in noisy environments.
The standout feature in our lab testing was speech-in-noise performance, where the Sphere Infinio scored an exceptional 3.08 points above the category average—the kind of margin that reflects Phonak's new on-board AI processing technology. Speech in quiet also measured 1.39 points above average, and music streaming quality exceeded typical performance by 0.77 points. These strengths make it particularly well-suited for active users who frequently encounter challenging listening situations like restaurants, gatherings, or meetings.
The device does show some trade-offs. Own-voice comfort measured slightly below average, and feedback handling in the tuned condition dropped compared to the initial fit, suggesting that pushing for maximum audibility can stress the feedback management system. Users sensitive to the sound of their own voice may notice some occlusion effects with the closed vented dome coupling.
The Phonak Sphere Infinio competes directly with the Oticon Intent and Signia Active Pro IX in this price tier. For listeners prioritizing speech clarity in noise above all else, the Sphere Infinio's AI-driven processing offers a compelling advantage. It earned HearAdvisor's Expert's Choice Award in both 2023 and 2024.
