How do I know if my left and right speakers are connected correctly?

Play a tone through one channel at a time. If the left tone comes from the left speaker and the right tone from the right, the wiring is correct. If they are swapped, reverse the cables or check your balance setting.

Can I test stereo speakers on my phone?

Yes. A browser-based stereo test works on any phone, laptop, or desktop with built-in speakers, headphones, or earbuds, and needs no app.

How to Test Left and Right Speakers (Stereo Test)

Q: Why is sound only coming from one speaker?

Usually an audio balance slider pushed to one side, a mono audio setting, or reversed or loose wiring. Center the balance, turn off mono audio, and check the connections.

Quick answer: To test your left and right speakers, play a tone through one channel at a time and confirm the sound comes from the matching side. A browser stereo test does this in under a minute — if a side is silent, faint, or swapped, you have found the problem.

Try it now: open the speaker test , then play the left channel and the right channel in turn and listen to which side each comes from.

How to run a left/right speaker test

1. Open the test and set a safe volume

Go to the speaker test and start at a low volume (around 10–20%) so a sudden tone is comfortable. No download is needed — it runs in the browser.

2. Play the left channel

Trigger the left tone. The sound should come only from your left speaker or left earbud. If it plays from the right instead, your channels are swapped.

3. Play the right channel

Now play the right tone. It should come only from the right side. Hearing it on the left confirms reversed wiring or a flipped balance setting.

4. Check the balance

Play both channels together. They should sound equally loud and centered. If the sound pulls to one side, your stereo balance is off.

What the results mean

Left plays when you trigger right

Your channels are swapped. On wired speakers, switch the left and right cables at the amplifier or audio interface. On a laptop, check that no audio software is flipping the channels.

One side is silent or much quieter

This is the most common stereo fault — usually a balance slider pushed to one side, a mono setting, or a damaged cable. Our guides on no sound from laptop speakers and headphones working on one side walk through the fixes.

Why is sound only coming from one speaker?

The usual causes are an audio balance slider that has slipped to one side, a "mono audio" accessibility setting that collapses both channels onto one side, or reversed or loose wiring. Center the balance in your sound settings, turn off mono audio, and reseat the connections, then re-run the test.

Does the stereo test work on a phone or laptop?

Yes. A browser-based stereo test runs on any phone, laptop, or desktop, and works with built-in speakers, wired headphones, or Bluetooth earbuds — there is nothing to install.

Confirm your speakers

When the left tone plays only on the left, the right only on the right, and both sound equally loud together on the speaker test , your stereo setup is correct.