This left right audio test plays a voice that says "left" from your left channel only and "right" from your right channel only, so you know in two seconds whether your headphones or speakers are wired the right way round. It is also a full stereo test: the center position should sound right between your ears, the balance check measures how much quieter one side is, and the polarity check finds a driver wired backwards. Use it with headphones, earbuds, a headset or a pair of speakers on Windows, Mac, ChromeOS, iPhone and Android. If you would rather test in another player, a TV or a car, download the same test as an MP3 or WAV file.
How to use the left and right test
- Put on your headphones the right way round, or sit in front of the middle of your speakers.
- Press Left in the drawing. You should hear "left" in your left ear or speaker only. Press Right and check the other side.
- Press Check each speaker for a guided run that records Yes, No sound or Wrong place for each side.
- Open Balance, play the center noise and move the slider until the sound sits dead center.
- Open Polarity and compare the two sounds, then answer which one was more solid.
- Open Test files to download the MP3 or WAV version.
What you should hear
| Test | Correct result | If it is wrong |
|---|---|---|
| Left | Voice in the left ear or speaker only | Heard in both: mono. Heard on the right: swapped |
| Right | Voice in the right ear or speaker only | Same as above |
| Center noise | A single sound in the middle of your head or between the speakers | Pulled to one side: balance is off |
| Balance reading | Under 1 dB | Over 3 dB points to a weak driver, a blocked earbud or a hearing difference |
| In phase | Solid, centered, full | Sounds thinner than Out of phase: one side reversed |
| Out of phase | Wide, hollow, hard to place, thin bass | Sounds the same as In phase: you are hearing mono |
Both sides play the same sound
When "left" and "right" both come from both sides, something is turning stereo into mono:
- Mono audio is on. Windows 11: Settings, then Accessibility, then Audio, then Mono audio. Windows 10: Settings, then Ease of Access, then Audio. Mac: System Settings, then Accessibility, then Audio, then Play stereo audio as mono. iPhone: Settings, then Accessibility, then Audio and Visual, then Mono Audio. Android: Settings, then Accessibility, then Audio adjustment, or Hearing enhancements on Samsung.
- A mono cable or adapter. A plug with only one black ring carries one channel. Stereo plugs have two rings, and headset plugs three. Some cheap splitters and extension cables are mono.
- Bluetooth Hands-Free mode. When an app opens the headset's microphone, Bluetooth switches to a mono, low quality mode. Windows 10 lists the headphones twice, as Headphones and as Headset: pick Headphones. Windows 11 shows one entry and switches by itself, so close calls and voice chat, or use another microphone, when you only want to listen.
- A single speaker. Smart speakers, many Bluetooth speakers and some monitors have one driver or mix both channels together. That is normal.
Left and right are swapped
Check the L and R marks first: on earbuds they are printed inside the stem or the shell, and on over-ear headphones inside the headband or the earcups. On speakers, swap the two plugs or speaker wires at the amplifier. If you cannot get at the cables, a Mac can reassign the sides in Audio MIDI Setup with Configure Speakers, and on Windows the free Equalizer APO can swap the channels. When this test is correct but one game sounds reversed, look for a channel or speaker setting inside that game.
One side is quieter than the other
Run the Balance check: it shows in decibels how much quieter one side reaches your seat. Then work through the causes:
- The balance slider. Windows: open the Sound control panel, your device, Properties, Levels, then Balance. Mac: System Settings, then Sound, then Output. iPhone: Settings, then Accessibility, then Audio and Visual, then Balance. Android: the same accessibility page as Mono audio.
- A blocked earbud. Earwax on the mesh is the usual cause of one quiet AirPod or earbud. Clean it with a dry soft brush, never liquid.
- Fit. An earbud tip that does not seal loses bass and level on that side only. Try a larger tip.
- Your hearing. Swap the headphones around. If the quiet side stays on the same ear, the difference is in your ears, and a hearing frequency test or a visit to an audiologist is worth it.
The center sounds hollow or comes from everywhere
That is a polarity problem: one driver pushes out while the other pulls in. Out of phase sound loses its center and most of its bass. On speakers, one wire is reversed: swap the red and black wires at one speaker only. On headphones the fault is inside the earcup and needs a repair or a replacement. Voices that almost disappear while music still plays point to the plug instead: the ground contact of the plug is not touching. This happens with headset plugs in older sockets and with worn adapters.
Left and right on Bluetooth earbuds and headsets
True wireless earbuds send each side separately, so a silent bud often means a low battery or a lost connection rather than a channel fault. Put both buds back in the case for 30 seconds and test again. For a headset on a PC, also try the headphone test left and right, which covers drivers and sockets, and the headphones not working on pc guide if one side never comes back.
Download the left and right test file
Open Test files in the tool. The MP3 (about 1 MB) and the WAV (about 7 MB) run for 43 seconds: an announcement, then left, right and center twice, each with a spoken name and three noise bursts, then in phase and out of phase passages. Play the file on a TV or a car stereo from a USB stick, or in any media player when you want to rule out the browser.
What a left right audio test cannot check
The test cannot see your headphones, so it depends on what you hear. It checks two channels: for 5.1 and 7.1 use the speaker tester layouts instead. It also cannot tell where in your head a sound sits with a full 3D head model. That is what the 3d audio test is for. Balance readings include the shape of your room and your seat, so on speakers, measure from your normal listening spot.
Left and right audio questions
Why do I hear left and right in both ears?
Your system is playing mono. Turn off Mono audio in the accessibility settings (Windows, Mac, iPhone and Android all have it), check for a mono cable or adapter, and on Bluetooth headphones close any app that is using the headset microphone (on Windows 10, choose the Headphones entry instead of Headset).
Why is left coming out of the right side?
Headphones on backwards is the usual answer, so look for the L and R marks. On speakers, swap the two cables or speaker wires. If the test is correct and one game or app is not, the swap is a setting inside that app.
How do I fix one side being louder?
Open the Balance check here and move the slider until the noise is centered: the reading tells you how far off it is. Then set the balance slider in your system settings, clean the quieter earbud's mesh, and swap the headphones around to see if the weak side follows the earcup or your ear.
Can I download a left right audio test file?
Yes. Open Test files under the drawing for an MP3 and a WAV. Each one says left, right and center from the matching side, plays noise bursts, then runs an in phase and out of phase check. Copy it to a USB stick to test a TV or a car stereo.
Does the left right audio test work on iPhone and Android?
Yes. Use headphones, since the two speakers on a phone sit only a few centimeters apart. If both ears play the same thing, look for Mono Audio in the phone's accessibility settings.