Phonak Sphere Infinio Ultra Expert Review

The Phonak Sphere Infinio Ultra is a premium behind-the-ear prescription hearing aid released in 2025, priced at $4,398. In HearAdvisor's lab testing, it achieved an outstanding SoundScore of 4.58 out of 5, placing it among the top performers in the prescription hearing aid category.

The standout feature of the Sphere Infinio Ultra is its exceptional speech-in-noise performance, measuring 2.88 points above the category average—a substantial margin that reflects Phonak's continued investment in complex listening environments. Speech in quiet also performed well above average, particularly after professional tuning. However, feedback handling scored slightly below the category average, though it remained functional across both fit conditions.

This device responds particularly well to professional optimization. The tuned fit configuration showed meaningful improvements in speech performance while maintaining the same open vented coupling, suggesting the fitting software offers considerable flexibility for audiologists to fine-tune results. Music streaming quality was solid in the initial fit but showed some trade-off when optimized for speech clarity.

The Phonak Sphere Infinio Ultra is best suited for users who prioritize understanding speech in challenging acoustic environments and are willing to invest in a premium device with professional fitting support. Those seeking maximum streaming audio fidelity or budget-conscious options may want to explore alternatives.