Left / Right Speaker Test
Check your headphones and speakers in seconds: left and right channels, stereo, frequency range and bass. Turn the volume down before you start.
Stereo channels
Press a button
You should hear the sound only from the side you pressed.
Frequency sweep 20 Hz – 20 kHz
— Hz
Bass & single tones
How to use the speaker test
- Turn your device volume down to around 30%.
- Press “Left” and “Right”. Each sound should come from one side only.
- Press “Center” — the sound should seem to come from the middle.
- Play the sweep to check the range of your speakers, and the 40 Hz tone to check bass.
Left and right are swapped — how to fix
- Headphones: look for small “L” and “R” markings on the ear cups or earbuds and swap them.
- Desktop speakers: swap the speakers or the cables at the back of the amplifier.
- Windows: Sound settings → your output device → check that “Mono audio” is off and the balance is centered. Some audio drivers (Realtek, Dolby, Nahimic) have a “swap channels” option.
- macOS: System Settings → Sound → Output → Balance, and Accessibility → Audio for mono.
About the frequency test
Humans hear roughly 20 Hz to 20 kHz, and the upper limit drops with age — many adults stop hearing tones above 15–17 kHz. Laptop and phone speakers rarely reproduce anything below 100–150 Hz, so the 40 Hz tone may be silent on them even though they are working correctly.
Frequently asked questions
How do I test left and right speakers?
Press “Left” — you should hear the sound only in the left ear or speaker. Then press “Right”. If you hear it on the wrong side, your headphones are on backwards or the channels are swapped in your sound settings or cable.
I hear sound from both sides when I press Left. Why?
Your system is probably set to mono audio. On Windows check Settings → Accessibility → Audio → Mono audio; on iPhone Settings → Accessibility → Audio/Visual → Mono Audio; on Mac System Settings → Accessibility → Audio. Some Bluetooth speakers also play everything in mono.
What does the frequency sweep test?
It plays a tone from 20 Hz to 20,000 Hz. Note when you start and stop hearing it — that shows your speakers' range and, roughly, your own hearing. Most adults can't hear above 15–17 kHz, and small laptop speakers produce almost nothing below 100 Hz.
Is this safe for my speakers and ears?
Start with a low volume and turn it up gradually. Very low frequencies at high volume can damage small speakers, and high frequencies at high volume can be unpleasant.
Why is one side of my headphones quieter?
Check the balance slider in your system sound settings first. If the balance is centered, the cause is usually a damaged cable, a dirty jack or earwax in the ear tip mesh.