Speaker Test: Check Output, Left/Right, Rattle & Polarity

Turn your volume down, press Play check tone and work through the five steps: output, channels, range, rattle and polarity. Listen for the expected cue in each step, then follow the suggested checks if something sounds wrong. These checks help you assess playback and channel routing, spot audible distortion or rattles, and compare relative polarity at your seat. They do not identify a faulty component or prove how a speaker is wired. For a deeper check of left and right on their own, the left and right speaker test has a dedicated workflow.

How to run a speaker test

1. Lower the system volume first. The tool level starts at 5% and stops at 25%, but it cannot see your amplifier, the speakers' own volume knob or your phone's buttons. Start low and raise it only until the check tone is comfortable.
2. Play the check tone. Step 1 plays 440 Hz on both channels for two seconds. Nearly every speaker reproduces this frequency well, so silence here can come from routing, connections, amplification or a faulty speaker.
3. Check each channel. Step 2 plays short bursts of noise on Left, Both or Right, or left first and then right. Noise is easier to place than a pure tone, so you can point to where each burst comes from.
4. Play the six range tones. Step 3 runs 60, 125 and 250 Hz, then 1, 4 and 10 kHz. Listen for crackle, buzz or one side sounding duller than the other. Repeat any tone on Left or Right to compare the speakers.
5. Run the rattle sweep. Step 4 glides slowly upward. Press Stop as soon as anything buzzes, then use Hold to replay that frequency while you look for the cause.
6. Compare polarity. Step 5 plays pink noise in two versions. Sit midway between the speakers with matching playback paths. In phase usually sounds more focused and fuller; the inverted version sounds wider and thinner. If that pattern is reversed, a relative polarity mismatch may be present in the wiring or upstream path. The A/B alone cannot identify the cause.

Space plays or stops the current step when focus is outside the controls, Escape always stops playback, and sound ends when you switch tabs or leave the page. Changing step stops whatever is playing.

What each result means

A speaker test hears the whole chain at once: the device, its sound settings, the cable, the amplifier, the speaker and the room. A failed step tells you where to look first, not which part is broken.

No sound from your speakers?

Start with the route. Most silent speakers are fine. The sound is simply going somewhere else. Work through these in order and press Play check tone after each change.

• The output device. Computers often have several outputs: built-in speakers, a monitor, an interface, a Bluetooth headset that connected on its own. Pick the speakers you want to test before anything else.
• Volume and mute everywhere. Check the system volume, the app or browser tab, and the speakers themselves. Microsoft's guide to fixing sound problems in Windows puts it simply: "Some speakers and apps have their own volume controls. Be sure to check them all."
• Power and cables. Powered speakers need their own power and often have a switch at the back. Reseat each cable; on a computer, Microsoft notes that some systems use a green jack for output and a pink one for the microphone, while others label them. For USB speakers, try a different USB port.
• Headphones. A plugged-in headset can take over the output. Unplug it, or switch Bluetooth off for a moment, and play the tone again.

Speaker test on Windows

Select the Speakers icon on the taskbar, then the arrow to the right of the volume slider. Its tooltip reads "Select a sound output". Choose your speakers from the list. If they're missing or silent, Microsoft's guide adds three checks: open the device's properties and make sure "Use this device (enable)" is selected, set Audio enhancements to Off under Advanced settings, and run the audio troubleshooter under Troubleshoot > Other troubleshooters.

If one side is quiet or both sides play the same thing, open Settings > System > Sound and look at two controls covered in Microsoft's article on audio playing in only one channel. Under the device's Volume settings, both Left and Right should be at the same level, "typically 100". Mono audio should also be off, because it "converts stereo sound into a single channel". With Mono audio on, the channel and polarity steps can't work.

Speaker test on Mac

Open System Settings > Sound > Output and select your speakers. Apple's page on Mac speakers with no sound lists the details: the output volume slider isn't all the way to the left, and Mute isn't selected. External speakers need their own power and volume up. USB speakers should appear under USB in System Information. If they don't, unplug them and plug them in again. With digital output, Apple says the computer's volume controls can't change the level. Adjust the volume on your receiver instead.

Two more settings matter for this test. Apple's sound output settings guide describes the Balance slider, which should be centered, and notes that an app's volume "can only be equal to or less than the computer's output volume". For speakers on an external audio interface, Audio MIDI Setup has its own check. Apple's guide to configuring stereo speakers in Audio MIDI Setup says to select the output device, click Configure Speakers, then "Click the Left or Right speaker icon to test the speaker". The same page notes you may need to configure them manually "if the left and right speakers are connected backwards".

One speaker silent, or left and right swapped

Play Left, then Right, in step 2. If one burst is silent, swap the two speakers' cables at the amplifier or interface. If the silence moves to the other speaker after swapping only at the source, inspect that source output and its routing. If it stays with the same physical speaker, inspect that speaker, its cable, power and input. If left and right are reversed, swap the cables at one end, or fix the mapping in Audio MIDI Setup on a Mac.

A small difference in level between sides is common when you sit off-center or one speaker is near a wall. The speaker placement calculator helps you set up an equal triangle before you blame the speakers. For named Left, Center and Right checks and a full list of channel fixes, use the dedicated left/right speaker check.

Speaker polarity: what out of phase sounds like

A relative polarity reversal flips the signal on one side while left and right can still play from the correct speakers. It can start in speaker wiring, a balanced cable or upstream processing. In his rundown of common studio problems for Sound On Sound, Paul White describes the result: one woofer moves in while the other moves out, causing "a loss of bass, a lack of focus in the sound-stage" and a feeling "like having your ears sucked out by a sink plunger!" He gives the usual causes as crossed positive and negative cables on passive speakers, or an incorrectly wired balanced cable on active ones.

The polarity step plays pink noise because a steady sine tone makes the difference hard to hear. Hugh Robjohns calls checking polarity with a constant tone "surprisingly difficult" in his Sound On Sound guide to building a test CD, and the same guide describes band-pass pink noise test tracks with polarity reversals in one channel. Matt Houghton suggests the same kind of listening in a Q&A on polarity inverters: check "whether the stereo image becomes more or less focused when flipped".

• Expected listening cue: sit midway between the speakers and use matching playback paths. In phase usually sounds like a focused band of noise between them, with more weight low down. One side inverted tends to sound wider and thinner. Room reflections, unequal distances and processing can weaken or alter that contrast.
• Inverted sounds more focused: inspect the wiring and upstream polarity or processing before changing a connection. On passive speakers, compare both cable runs with the speaker and amplifier manuals. Switch the amplifier off before correcting a confirmed reversed connection. On active speakers, check the balanced cable pinouts and processing settings. Do not swap wires from this listening result alone.
• Almost silent when inverted: check for mono summing in the device, accessibility settings or upstream mixer. Adding equal copies of the same signal with opposite polarity cancels them; a mono sum can therefore suppress this inverted test signal. Disable unwanted Mono audio settings and repeat through a stereo pair. A single mono output cannot compare the relative polarity of two speakers.

Use Alternate 3 s if switching by hand is too fast to judge. The polarity step compares the combined playback at your seat; it cannot separate a speaker fault from a cable or upstream cause. To inspect how the channels of a recording relate, load it into the phase correlation meter.

Find a rattle or buzz

A buzz that appears at one point in the sweep is usually something vibrating in sympathy rather than the speaker failing. Celestion's Dr Decibel speaker FAQ makes the point for guitar cabinets: "buzzing is often caused by a cabinet panel or part of the amp that's come loose". Check that screws are tight and that no wires are resting on the back of the speaker cone. The same advice carries over to desk and shelf setups.

Stop the sweep at the buzz, press Hold and work outward from the speaker while it plays. Press lightly on the cabinet, the grille, the stand, the desk and anything sitting near the speaker. When the buzz stops under your hand, you've found it. If nothing nearby changes it, compare the same frequency on Left and Right in step 3. A buzz on one speaker only, at every level, points to the driver: Celestion notes that "small tears often cause buzzing".

Test a passive speaker with a multimeter

If a passive speaker stays silent on a channel you've proved works, a multimeter can tell you whether there's an unbroken path through it. This applies to passive speakers and bare drivers only. Powered speakers have an amplifier inside, so leave them to the manufacturer's service guidance.

1. Disconnect it. Celestion's first step is to disconnect the speaker from the amplifier by removing the wires from its terminals.
2. Move the cone gently, if you can reach it. Celestion says to move it in and out by hand without forcing it; there should be no grating or scraping, and it should spring back. Skip this if a grille or dust cap is in the way.
3. Measure resistance across the terminals. Celestion's rule of thumb for a single driver: "An 8ohm speaker should measure somewhere between 5 and 8ohm and a 16ohm around double that." A reading far outside that range suggests a bad joint, and an open circuit means no path at all.

The number on the meter won't match the rating, and that's expected. Rated impedance isn't a DC reading. Dynaudio's Otto Jørgensen explains in an expert note on impedance that "impedance varies with frequency", and that under IEC 60268-5 an 8-ohm speaker's impedance should never fall below 6.4 ohms within its rated range. Pat Brown at ProSoundTraining makes the same point in his piece on nominal versus minimum impedance: impedance is "both complex and frequency-dependent".

On a complete speaker with a built-in crossover, the reading at the input terminals includes the crossover parts. So don't judge it against the single-driver rule. Compare it with the other speaker of the pair. Two matching readings and one open circuit is a clear answer. If the cables themselves are long or thin, check them with the speaker wire size calculator.

Judging speaker sound quality

Test tones confirm that speakers work. They don't tell you whether you'll enjoy listening to them. For that you need music, and a fair comparison. Sean Olive describes a 1994 Harman study of sighted versus blind listening tests in which 40 Harman employees rated four speakers. When listeners could see the speakers, preference rose "for the larger, more expensive loudspeakers". The blind tests also showed clear positional effects, so where a speaker stands changes how it is judged.

Level matters as much. In Olive's write-up on evaluating iPod music stations, the products were "level-matched within 0.1 dB at the listening position by playing pink noise through each unit". You won't match that by ear. But you can get closer by setting each speaker so the pink noise generator sounds equally loud from your seat, then switching quickly between them with the same few tracks. I'd use songs you know well, played from a source you trust. A demo video recorded through someone else's speakers mostly tells you about your own speakers and that recording, not the ones on screen.

Subwoofer polarity

The polarity step compares your two main speakers. A subwoofer has its own polarity or phase control, and its job is different. In Sound On Sound's audio test files guide, Robjohns describes playing an 85 Hz tone through the subwoofer and satellites together, adjusted "to make the tone sound as loud as possible at the listening position". This page sends stereo, not a separate LFE channel. For your own setup, follow the subwoofer manual and compare near the actual crossover, where both the main speakers and sub are contributing; 85 Hz is an example, not a universal setting. If your system routes that frequency to both, use the online tone generator at a quiet level and compare the sub's polarity or phase settings from your seat, leaving the playback level unchanged. A fuller sum at one frequency is a starting point; check the response around the crossover before treating the alignment as finished.

Phone speakers and water

On a phone, this page plays through the phone's current media output, so the first three steps work as a quick speaker check. Water is a different matter, and here the manufacturer's guidance beats any test tone. Apple Watch has a built-in water-clearing feature: Apple's article on Water Lock and ejecting water from Apple Watch says that when you press and hold the Digital Crown to unlock it, "a series of tones plays to clear any water that remains in the speaker". On watchOS 8 or earlier, you rotate the crown instead.

For iPhone, Apple's splash and water resistance guide describes drying, not tones. Tap the iPhone gently against your hand with the connector facing down, then leave it in a dry area with some airflow. To check the speaker, place it speaker side down on a lint-free cloth and see if water drips out. Apple notes that water in the port "might degrade speaker or microphone performance until it completely evaporates". So a muffled iPhone speaker after a splash is worth a few hours of drying before you test it again.

Keep speaker tests quiet

Test signals are steady, with none of the pauses and dynamics of music, so start quiet and stay brief. The tool level starts at 5% and caps at 25%. Each step stops on its own (two seconds for the check tone, about 11 seconds for the range tones, 30 or 40 seconds for a sweep, 30 seconds for polarity), and Escape stops everything.

High frequencies need the most care. Robjohns warns in the test files guide that a 24 kHz tone "could damage speaker tweeters without anyone hearing it". The full sweep here stops at 20 kHz and the range tones top out at 10 kHz, but the principle holds: if a high tone goes silent, turn it off rather than up. Stop at any crackle, buzz or discomfort.

What this speaker test cannot tell you

• It does not measure sound pressure level, frequency response or distortion. There is no microphone and no calibration.
• It hears your speakers, room and hearing together; it cannot separate them.
• It is not a hearing test. If you cannot hear 10 kHz on either side, that is not proof your tweeters are dead.
• Processing in your operating system, browser or speaker, such as enhancements, spatial audio, EQ or Bluetooth codecs, changes what you hear.
• It plays stereo only. It does not test center, surround or LFE channels.

How the page makes the sounds

Tones come from a Web Audio OscillatorNode set to a sine wave, which MDN describes as "in effect, a constant tone". Each tone fades in and out to avoid clicks. The sweep uses an exponential frequency ramp, which MDN's exponential ramp reference recommends for frequency changes "because of the way the human ear works". The noise is pink: white noise filtered so each octave carries equal energy, which Sound On Sound calls "a very natural-sounding form of noise". For the inverted version, the page writes the same noise into the right channel with every sample's sign flipped. Sound only starts after you press a button, as the browser autoplay rules require, and nothing is recorded or uploaded.

Speaker test FAQ

How do I test my speakers?

Lower the volume, play a short mid-frequency tone to confirm sound comes out, then check left and right separately, listen to a few tones from low to high, sweep for rattles and compare polarity. The tool above runs those five steps in order.

Why is there no sound from my speakers?

Usually the output is set to another device, something is muted, or the speakers are off or turned down. Select the speakers as the output in Windows or macOS, check every volume control including the speakers' own, unplug headphones and reseat the cables.

How do I know if my speakers are out of phase?

Play the polarity step from a centered seat with matching playback paths. In phase usually sounds more focused and fuller; One side inverted sounds wider and thinner. If In phase is the hollow one, inspect speaker wiring and upstream polarity or processing before changing a connection. Room reflections and unequal distances can also change the result; the A/B alone does not identify the cause.

How do I test a speaker with a multimeter?

Disconnect the passive speaker from the amplifier and measure resistance across its terminals. Celestion's rule of thumb for an 8-ohm driver is a reading between 5 and 8 ohms. An open circuit means no path through the speaker.

Can a sound remove water from my phone speaker?

Apple Watch plays its own water-clearing tones when you turn off Water Lock. For iPhone, Apple's guidance is to tap out excess liquid with the connector facing down and let the phone dry with some airflow; water in the port can muffle the speaker until it evaporates.

Is a speaker test safe?

Yes, if you keep it quiet and brief. Lower the system volume before you press Play, stop at any crackle or discomfort, and never turn up a high tone you cannot hear.

Does the speaker test use my microphone?

No. The page generates tones and noise on your device and does not request microphone access, read files or upload audio.

Are test tones or music better for testing speakers?

Test signals help isolate silence, channel routing and rattles; the polarity A/B adds a listening cue rather than a wiring diagnosis. Music is better for judging sound quality, as long as you compare speakers at matched levels with tracks you know well.