To test your speakers, open a speaker test and play a tone in the left channel, then the right, then both. If sound comes from the matching side each time, your speakers work and are wired correctly. The free speaker test plays each channel on demand and runs a frequency sweep, all in your browser.
That is the short version. Here is how to use each part and read the result.
Why test each channel separately
Most audio faults are not “no sound at all”. They are subtler: one side is dead, the two sides are swapped, or the balance has crept over so far that it sounds like one speaker has failed. Playing both channels together hides all of these, because your ear fills in the gap. Testing left and right on their own is the only way to catch them.
How to test your speakers
Step 1: Select the right output
Make sure the device you want to test is the one your system is actually using. Plugging in headphones does not always switch the output, and a monitor or a Bluetooth speaker can quietly stay selected. Set the volume to a comfortable, modest level before you start.
Step 2: Play left, then right
Play the left-only tone. You should hear it from the left side alone. Do the same for the right. If a side is silent, or the sound comes from the wrong place, you have found a real problem rather than imagined one. Headphones worn the wrong way round are a common and harmless cause of a “swap”.
Step 3: Run the sweep
The frequency sweep rises from low to high over a few seconds. On capable speakers or headphones you should hear it climb smoothly with no gaps and no buzzing. A drop-out in the middle, or a rattle, usually means a damaged driver. Missing notes only at the very top or very bottom are normal on small built-in speakers.
Reading the results
- One side silent. Try another cable or port first, since cables fail more often than speakers. If it follows the speaker, the driver or its wiring is the fault.
- Channels swapped. Check the cable, the connector, and any left/right balance setting before blaming the hardware.
- Buzzing or distortion. Lower the volume and listen again. Distortion only at high volume can mean the speaker is being pushed too hard; distortion at any volume points to damage.
- Quiet on one side. This is usually a balance setting rather than a fault. Reset balance to centre and retest.
When it is the source, not the speakers
If both the left and right tones sound wrong in the same way, the problem may be upstream, in the output device, a balance setting, or an audio enhancement turned on in your system. Testing on a second device, like headphones plugged straight into a phone, quickly tells you whether the speakers or the computer is at fault.
Once playback is sorted, a microphone test confirms you can be heard as well as hear, which is the other half of any call.