Stereo Polarity Test
Test if your speakers or headphones have correct stereo polarity. Detect reversed wiring that causes phase cancellation.
If both tests sound the same, one of your speakers or headphone drivers may have reversed polarity (wired incorrectly).
How does this test work?
A stereo polarity test plays in-phase and out-of-phase tones. In-phase sound should appear centered. If both tests sound the same, one speaker has reversed polarity.
How to use the Stereo Polarity Test
Open the Stereo Polarity Test on any device with a modern browser — desktop, laptop, tablet, or phone. No downloads, plugins, or signup required. The tool loads instantly and works in Chrome, Firefox, Safari, Edge, and other Chromium-based browsers.
Follow the on-screen instructions to run the test. Results are displayed immediately in your browser. You can repeat the test as many times as needed. For the most accurate results, close other tabs and applications to reduce interference.
Privacy: This test runs entirely in your browser using standard web APIs. No data is collected, uploaded, or stored on any server. Camera, microphone, keyboard, mouse, and controller inputs are processed locally and never leave your device. DeviceKit does not use analytics cookies or tracking scripts.
Browser note: Some hardware values are estimated because browsers limit direct access to device hardware for security and privacy reasons. Results may vary slightly between browsers and operating systems. For the most reliable measurements, use an up-to-date version of Chrome or Edge on a desktop computer.
Frequently Asked Questions
What is stereo polarity?+
Stereo polarity means both speakers push and pull air in sync. If one speaker is wired backwards, the waves cancel out, causing thin, diffuse sound with weak bass.
Related Tests
Left Right Speaker Test
Test left and right speaker channels independently. Verify your stereo setup is wired correctly.
Speaker Test
Test your speakers with different frequency tones. Check bass, midrange, and treble reproduction.
Headphone Test
Test your headphones for left ear, right ear, and stereo audio. Verify both drivers are working.