Apple Opens Doors to Its iPhone Audio and Video Testing Chambers

Apple recently invited CNET‘s Patrick Holland to tour its specialized laboratories in Cupertino where company engineers test and calibrate the iPhone 16’s audio and video capabilities.

Holland’s visit centered on a long wave anechoic chamber, where walls, ceiling, and floor are covered with foam wedges to eliminate echoes. The facility is used for testing the iPhone 16’s four microphones, which despite their small size, are engineered to deliver professional-grade audio quality.

“The iPhone is such a ubiquitous recording device and gets used in so many different environments that we want to make sure that we’re able to capture the memory that our users are trying to capture in the truest form,” explained Ruchir Dave, senior director of acoustics engineering at Apple.

“The approach we took was to go after both quality as well as utility. And as part of that, we developed a novel microphone component that allows us to deliver some of the best acoustic performance in a phone product,” said Dave. “At the same time, [we] developed a feature like Audio Mix that gives users the flexibility to be able to capture different sounds and gives you that creative freedom in the edit to adjust it how you like.”

The testing process Apple uses includes a sophisticated array of speakers that play chimes while the iPhone rotates, creating a spherical sound profile. This data forms the foundation for features like spatial audio and Audio Mix, which allows users to adjust recorded audio to simulate different microphone types. In separate soundproof studios, Apple conducts comparative playback tests with multiple testers to ensure consistent audio quality.

The tour’s highlight was a theater-sized video verification lab, where Apple engineers calibrate display performance across various lighting conditions. The facility features a massive screen that simulates how videos appear on iPhone displays, whether viewed in dark rooms, offices, or bright sunlight. For all the details, check out the full writeup over at CNET.