Lower the device volume
Choose 440 Hz or 1000 Hz, keep the digital level modest, and begin with the computer, phone, interface, or speaker volume low.
Stereo channel check
Left / Right Speaker Test
Play a short, low-level reference tone through the left, right, or both channels to check stereo routing in headphones or speakers.
Left and right speaker test controls
Short stereo reference
Listen to each output path
Ready · 440 Hz reference
Start with your device volume low and raise it slowly only if the tone is comfortable. Use stereo headphones or a stereo speaker pair. Mono output, Bluetooth processing, or OS accessibility balance can alter what you hear.
A quick listening workflow
Check stereo channels in three steps
Play left, right, then both
Click each channel button and listen for the tone in the expected side. Use Both as a quick comparison, not as a frequency-response measurement.
Trace a missing side
If one side is silent, check OS balance, accessibility balance, cable connections, and mono output settings before assuming a speaker has failed.
What this speaker test checks
The browser sends a short stereo reference to the selected output channel. It helps confirm whether left, right, and both-channel routing reaches the expected side of a stereo setup.
What it cannot diagnose
Not hearing a tone is not a hardware diagnosis. Mono playback, Bluetooth processing, operating-system balance, a muted device, or a disconnected cable can change the result, and this page does not measure frequency response, loudness, or acoustic speaker health.
Common questions
Left and right speaker test FAQ
Does this measure frequency response?
No. It is a channel-routing check with a short sine reference. It does not measure frequency response, dB SPL, distortion, or the condition of a physical speaker.
Why do left and right sound the same?
Mono output, Bluetooth or other signal processing, and an OS accessibility balance setting can collapse or shift the stereo image. Check those settings and the selected output device.
What should I check if one side is silent?
Confirm the device is not muted, inspect the left/right balance, reseat the cable or headphones, and test another output. A silent result here alone cannot prove a hardware failure.