Can you hear the other side? Check system mute, balance and selected output first. Repeat Play left and Play right separately before changing a cable or speaker.
Sound test
Play local tones on the left, right or both channels, then compare what you hear. This sound test cannot listen to your speakers.
Also known as: sound test, test sound, sound tester, left right sound test, stereo sound test, audio test, check sound audio, test audio, audio tester. Free, online, and no download required.
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Choose a channel and press play to create the audio context.
01
What the sound test checks
| Check | How it is measured | Fails when |
|---|---|---|
| Channel routing | An oscillator passes through separate gain nodes into explicit merger inputs. | A confirmed side is silent or the two sides are swapped. |
| Frequency samples | Nine bounded oscillator frequencies play only after a user action. | The output chain consistently drops a sample the device should reproduce. |
| Output context | The current AudioContext state and sample rate are read at runtime. | The context cannot resume or closes during playback. |
How to run the sound test
- Select the output device in your system, set a moderate volume and check mute and balance before pressing Play left.
- Play right and then the left-to-right sequence. Note the physical side you hear for each selected channel.
- If a side is silent or reversed, check mono audio, the cable or Bluetooth route one at a time, then repeat the audio test.
If something failed
The page sends a selected stereo channel, but cannot hear its physical destination. Disable mono or spatial processing, note which side actually plays and compare one connection change. See left and right speakers reversed.
Keep the same output and volume, then replay the same tone. If playback still stops, compare another application or connection; an interrupted browser context alone does not identify a damaged speaker.
02
How to read the result
Audio test for headphones, speakers and Bluetooth
Start the audio test with a single left tone. Hear nothing? Confirm that the intended output is selected, unmuted and at a moderate level before moving cables.
A left right sound test checks the route you can hear, not a microphone recording. Compare left, right and both under the same connection. A stereo sound test that sounds centred in every step calls for a mono-audio setting check.
The sound tester also offers bounded frequency samples. A missing high or low tone can depend on the output, room and hearing; check sound audio in the application where the symptom occurs before blaming hardware. Sound test does not identify a fault from one tone. For a position-by-position check, use the speaker test.
How the sound test works
A button press starts a local oscillator in an AudioContext. The page routes it through separate gain nodes into left or right ChannelMergerNode inputs. The browser then passes that stereo output to the selected system route.
Which side actually played? Only you can confirm that observation. The selected channel and AudioContext state describe what this page requested; neither is a measurement of sound at the physical speaker.
Use the same volume and output for each comparison. The test audio remains local. Closing the page ends the test; the page does not record your room.
What the result can establish
A correctly heard left tone and right tone support the current stereo route. If one side is silent, check mute, balance and the output device before testing a different cable or speaker.
Is only one application reversed? Repeat its sound while keeping the system route fixed. Application processing can differ from this browser test, so the page cannot identify the downstream cause by itself.
For headphones, verify orientation before changing settings. The stereo routing guide separates a reversed pair from one silent side and mono playback.
Measurement limits
The page can identify which stereo channel it created. It cannot read the speaker wiring or acoustic output after the operating system, interface and amplifier process it.
A generated tone is not proof that a physical driver played it. This audio tester relies on your hearing and confirmation; it cannot measure loudness, frequency response or independent surround channels.
Bluetooth profiles, mono accessibility settings and virtual surround can change the audible result. If bluetooth playback differs from a cable, note the active route, change one setting and run the same left/right sequence again.
03
Sound test questions
How does a left right sound test tell me which side is wrong?
Play left and right separately at a moderate level and note which physical side you hear. The page sends a selected channel, but cannot listen to the result. If both are reversed, check system routing and the connection with the stereo guide.
Why does this stereo sound test need me to press play first?
The browser requires a user action before starting or resuming an AudioContext. Press Play left or Play right; a silent page load does not mean the device failed.
Can this audio test check 5.1 or 7.1 surround speakers?
No. This audio test sends stereo left and right. It cannot confirm independent centre, rear or subwoofer speakers in a 5.1 or 7.1 setup. Use the operating system or receiver's channel setup for those positions.
How do I run an audio test on Windows?
Select the intended Windows output, check mute and balance, then play left and right here. Can you hear the selected side? If not, repeat with one connection or output change. This page cannot change the system's speaker mapping.
Why does audio play from only one speaker?
Check whether one side is muted by system balance, then play each channel separately. If both controls reach one side, check mono audio. If only one is silent, compare the cable and output before concluding the speaker failed.
How should I repeat the sound test fairly?
Keep output, connection, volume and processing unchanged. Play left, right and the sequence in the same order, record what you heard, then alter one setting for the next sound test.
What can the sound test not prove?
The sound test can generate and route a tone, but it cannot listen to the room or inspect a driver, amplifier or cable. A successful playback request is not an acoustic pass.