Left and right
Play each side separately. The opposite ear or speaker should remain silent.
Stereo channel check
Left Right Audio Test
Verify left, center, and right positioning. Run the automatic sequence, or play a continuous tone and move the balance control to check the full stereo field.
Browser audio engine
Ready — choose a test
Interactive channel map
Tap the ear you want to hear
Local audio
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Listening method
How to perform the channel test
Center image
Play Center. It should sound stable and equally loud between both sides.
Automatic order
Run Left → Center → Right without moving your head or changing volume.
Balance control
Play the balance tone and move it gradually. Position and loudness should change smoothly.
Audio basics
Mono vs stereo audio
Mono uses one channel, even when it is copied to two speakers. Stereo carries independent left and right signals, which creates direction and width. This tool pans a generated tone through the actual stereo output rather than changing the screen alone.
MONO
One shared signal
Left and right information is combined, so channel direction is lost.
STEREO
Two independent signals
Separate channels preserve position, movement, and spatial width.
If the result is wrong
Fix left and right audio problems
- Both sides playTurn off mono audio and spatial enhancements, then retry.
- Sides are reversedCheck L/R markings, detachable cables, and speaker leads.
- Center driftsCenter system balance and match speaker distance and angle.
- One side distortsLower volume and test another source before blaming the driver.
For smooth movement rather than fixed positions, try the stereo test. To check physical or virtual speaker layouts, use the surround sound test.
Useful answers
Frequently asked questions
What should the center tone sound like?
On headphones it should appear in the middle of your head. On two speakers it should form a stable phantom center between them. If it pulls to one side, check balance, placement, fit, and hearing symmetry.
Why does the left right sound test play on the wrong side?
The headset may be worn backwards, a detachable cable may be swapped, speaker leads may be reversed, or an app may be remapping channels. Confirm the L and R markings first.
Can mono audio pass a left right speaker test?
It can make sound, but it cannot preserve separation. If mono audio is enabled, Left and Right may both be heard from both sides.
Does this work with external speakers?
Yes. Sit centered between the speakers and run Left, Center, Right. The center tone should sound as if it comes from the space between the two speakers.
What if the channels are correct but one side is softer?
Center your system balance, clean earbud meshes, check speaker distance, and test another headset. Persistent differences across devices can also come from your hearing.