Audio Tool

Left Right Headphone Test

Play a short tone in only the left or right channel. If LEFT plays on the right side, your channels may be reversed.

Safety tip

Start with a low device volume. High-frequency tones and bass tests may sound louder or quieter than expected. Stop immediately if a sound is uncomfortable, painful or unexpectedly loud.

Idle

Guide reviewed on . Tests are browser-based, practical listening checks unless otherwise noted.

Why channel routing matters

Left and right routing affects music imaging, game positioning, video calls, and accessibility settings. A swapped channel can make direction cues feel wrong even when both speakers or earcups still produce sound.

This test isolates one channel at a time so you can check routing without relying on a song mix or game scene where multiple sounds may overlap.

Step-by-step test method

Place the headphones as you normally wear them, set a low volume, and press LEFT. The tone should be heard only from the left side. Press RIGHT and confirm the same behavior on the right side.

If you use speakers, sit centered between them. If you use earbuds, confirm the physical left and right markings first because some symmetrical earbuds are easy to swap.

Common causes of reversed channels

A reversed TRRS adapter, incorrectly wired extension cable, mixer routing, virtual audio driver, or operating system balance setting can make channels appear swapped.

  • Reconnect the cable and remove adapters for a second pass.
  • Check mono audio and balance controls in Windows, macOS, iOS, Android, or your sound card software.
  • Test another app or browser tab to separate site behavior from system routing.
Stereo TestListen to a tone moving across the stereo field.Balance TestCompare perceived loudness between the left and right sides.

FAQ

How do I test left and right headphones?

Click LEFT and confirm the sound comes only from the left side, then click RIGHT and confirm the right side.

Why are my headphone channels reversed?

A reversed cable, adapter, software balance setting, Bluetooth routing issue or device configuration can swap channels.

Why does only one side work?

Check the plug, balance settings, Bluetooth connection, ear pad fit and another device before assuming hardware damage.