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SPEAKER TEST

Speaker test

Four checks that tell you whether a speaker is actually faulty: both channels play, nothing buzzes, nothing drops out across the range, and it stays clean at volume. Works on a phone, a laptop, a car or a Bluetooth speaker.

Start at a low level and raise it gradually — sustained test tones are more fatiguing than music at the same volume.

1. Is each side alive

One channel at a time, so a dead speaker cannot hide behind a working one. On a car stereo, use the fader and balance to isolate one speaker per test.

2. Buzz and rattle

A slow descent from 200 Hz to 40 Hz. A sine wave contains nothing that should rattle, so anything you hear beyond a pure tone is the hardware. Note the pitch where a buzz starts — a narrow band means a loose part, a wide one means the driver.

3. Dropouts across the range

100 Hz up to 12 kHz. The level will rise and fall — that is normal for every speaker. What matters is a sudden gap where sound disappears entirely and comes back.

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4. Clean at volume

A steady 1 kHz tone. Start the tone, then raise the device volume gradually and listen for the point where the note turns harsh or gritty. Distortion only near maximum is the driver at its limit and is normal; distortion at a moderate level is not.

Reading the results

What you heardWhat it meansWhat to do
All four cleanThe speaker is workingIf it still sounds quiet, the limit is upstream
One side silentDead driver, or a broken cable coreTry another cable or source first, then repair
Buzz over a narrow band onlyA loose part resonating, not the driverRemove the case, move nearby objects, check mountings
Buzz or rasp across a wide rangeDamaged driverRepair — no amount of cleaning fixes this
Muffled, highs missing, no buzzBlocked grilleSpeaker cleaner, or water eject if it got wet
Sudden gap in the range sweepA genuine dropoutRetest on another device to rule out the source
Harsh only near maximum volumeThe driver at its limit — normalNothing
Nothing below ~300 Hz on a phoneExpected for a driver that smallNothing — compare on headphones

Testing because you have been running a volume booster hard? A booster changes the audio before it reaches the amplifier, so it cannot push a speaker past the maximum the device already allows — crackle at full volume is that limit, not damage. Is a volume booster safe covers the few cases where it can hurt a speaker, and the bigger risk, which is to your hearing.

What to expect from each kind of speaker

DeviceUseful bass fromThe thing that usually goes wrong
Phone~300–500 HzPocket lint in the grille, or a case over the port
Laptop~150–200 HzOutput switched to the wrong device after a headset was connected
Bluetooth speaker~50–80 HzCodec or connection dropouts that sound like speaker faults
Car~40–60 HzDoor panel rattle, and one dead speaker of four hidden by the rest
Headphones~20 HzA cable core breaking near the plug — wiggle it during the left/right test

Test conditions that change the answer

  • Take the case off. Cases covering or redirecting a speaker port are the single most common cause of "my speaker broke".
  • Check the output device first. Half of all laptop speaker faults are audio still routed to a headset that is no longer connected.
  • Test at a moderate level. At maximum everything distorts a little, and you lose the ability to tell a fault from a limit.
  • Try a second source. A dropout that follows the file rather than the speaker is the recording.

If the speaker is fine

A speaker that passes all four checks and still sounds underpowered is not a hardware problem. Run the wider sound test if you want a second opinion on the frequency range, use the left / right test for stereo imaging and phase, and work through iPhone volume low for the settings that cap output. When it is the recording that is quiet rather than the speaker, Volume Booster plays your own files above the phone's normal maximum with a bass dial and a 6-band equalizer.

FREQUENTLY ASKED QUESTIONS

How do I test my speakers?

Play a tone in each channel on its own and confirm both are audible at a similar level, then sweep slowly through the low frequencies listening for buzz, then sweep the full range listening for a dropout. Those three checks between them catch a dead driver, a loose part and a blocked grille, which is nearly every speaker fault that is not obvious by eye.

How do I know if my speaker is blown?

A blown driver buzzes, crackles or rasps on a clean tone — a sine wave contains nothing that should rattle, so anything you hear beyond a pure note is coming from the speaker rather than the signal. A driver that has gone completely is silent on its channel while the other still plays. Distortion only at high level is usually the driver reaching its limit, which is normal.

Why does my speaker buzz at certain frequencies?

Something is resonating. Sweep down slowly and note the pitch where the buzz starts and stops — a narrow band is almost always a loose part vibrating in sympathy, often the case, the mounting or an object near the speaker rather than the driver itself. A buzz across a wide range points at the driver.

Why does my phone speaker sound so thin?

Because it is physically tiny. A phone driver is a few millimetres across and cannot move enough air for deep bass; audible output usually starts somewhere around 300–500 Hz. Hearing nothing below that on a phone is expected, not a fault — compare against headphones and the difference is immediately obvious.

How do I test my car speakers?

Run the left and right checks first to confirm both sides and both front/rear pairs actually play — use the fader and balance to isolate one speaker at a time, because a car has four or more and a single dead one hides behind the others. Then sweep the low frequencies at moderate volume listening for door-panel rattle, which is far more common than an actual speaker fault.

What is a good frequency range for a speaker test?

Sweep 20 Hz to 20 kHz to see the whole picture, but judge what you hear against the device. Phone speakers roll off below a few hundred hertz, laptops below about 150 Hz, decent headphones reach 20 Hz. Whether the top end is audible depends on your ears at least as much as the speaker — most adults stop hearing somewhere between 15 and 17 kHz.

Is a browser speaker test as good as an app?

For generating test tones, yes — the tone is the same tone, and a browser test avoids an app’s own volume processing confusing the result. An app is only meaningfully different when it needs the microphone or has to work offline.

My speaker passes every test but sounds quiet. Why?

Then the hardware is fine and the limit is upstream: a volume cap, loudness normalisation pulling tracks down, a case over the port, or a recording that was mastered quietly. Those are settings and cleaning jobs, not repairs.

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