Headphone Tester

Verify left/right stereo channels, driver balance, frequency range, and phase polarity.

Stereo Channel Check

Frequency Range

--- Hz

Moving Balance Test

Sound pans automatically Left ↔ Right. Helps find driver imbalance.

Polarity / Phase

"Out Phase" should sound hollow/wide.

How to Test

  • 1.Set your volume to a safe, moderate level (50%).
  • 2.Stereo Test: Ensure sound ONLY comes from the clicked side.
  • 3.Balance Test: The sound should pan smoothly from left to right. If it jumps or stays centered, your settings are wrong.
  • 4.Phase Check: "In Phase" should sound solid and centered. "Out of Phase" sounds weirdly wide.

Troubleshooting

  • Sound in both ears when clicking 'Left'? Check if "Mono Audio" is enabled in Windows/Mac accessibility settings. Or your headphone plug might not be fully inserted.
  • No sound? Check if the browser tab is muted (speaker icon on tab) or if the correct output device is selected in OS settings.
  • Buzzing/Static? Try a different USB port or ensure the audio jack is free of dust.

Audio Diagnostics Guide

Why is my audio unbalanced (louder on one side)?

Channel imbalance is common. First, clean your earbud mesh or headphone pads. If the issue persists, check Windows Sound Settings > Device Properties and ensure the L/R balance slider is centered. If wired, a damaged cable is a frequent culprit.

Understanding Frequency Response

Ideally, headphones should reproduce sounds from 20Hz (deep sub-bass) to 20,000Hz (air/treble). If you can't hear the start of the sweep until 50Hz+, your headphones may lack bass. If sound disappears above 15kHz, don't worry—adult hearing naturally rolls off high frequencies over time.

[Image of human hearing frequency response chart]

Mono vs. Stereo Audio

Stereo sends different sounds to the left and right speakers, creating a sense of space and direction (critical for gaming). Mono combines both channels into one signal sent equally to both ears. Always disable Mono for testing.

What is Audio Phase?

When speakers are "In Phase," their cones move in and out simultaneously, producing solid bass and a centered image. If wired incorrectly ("Out of Phase"), one cone moves in while the other moves out, cancelling out bass frequencies and making audio sound thin and disorienting.