SPEAKER & HEADPHONE TEST / GUIDE

How Speaker and Headphone Testing Works

This test uses the browser Web Audio graph to generate a local sine tone and position it across the stereo field.

Browser-generated tone

The core signal is a 440 Hz sine wave generated after a user selects a test control. No remote audio file is required.

Left, center, and right pan

A stereo pan value of -1 represents hard left, 0 represents center, and +1 represents hard right. The Left, Both, and Right buttons use those fixed positions.

Why the sweep moves

The stereo sweep uses a fixed four-second pan timeline: left, center, right, center, then left. A moving visual indicator mirrors that deterministic plan when motion preferences allow it.

Digital gain is not acoustic loudness

The app controls the amplitude of the generated digital signal. Speakers, headphone sensitivity, amplifiers, operating-system volume, wireless devices, and physical fit all affect the sound pressure that reaches a listener.

Why playback requires a user action

Modern browsers commonly restrict audio that starts automatically. The test creates or resumes its audio context only after you choose a playback control.

Why the app cannot detect what you heard

The browser can know what signal it generated, but this output-only test does not listen through a microphone. It therefore cannot verify physical loudness, a silent speaker, or reversed hardware automatically.

What this test does not certify

It does not certify frequency response, distortion, latency, hearing ability, acoustic safety, surround sound, speaker condition, headphone condition, or professional audio quality.