Speaker Test Online: Free Left and Right Sound Test
Click Low, Mid, or High on this speaker test to check each driver in your speakers or headphones. The check microphone input levels needs a quick permission prompt the first time you run it, then gives you a live read-out in seconds.
Not sure both of your speakers work, or that the left speaker and right speaker are wired the right way round? Play the online speaker test tones on this page and you'll know in seconds which side each tone lands on, how low and high your system reaches, and whether it is wired correctly. It runs in your browser, with no download and no app.
How the Online Sound Test Works in Your Browser
Each button sends a short signal to your audio output, so a passing sound test proves the whole chain works: browser, operating system and speaker hardware. It works on a computer or phone, and nothing is recorded. The online hearing frequency test needs a quick permission prompt the first time you run it, then gives you a live read-out in seconds.
- Click Left, then Right, and note where each tone comes from.
- Play the rising tone and note where the tone appears and fades.
- Play the polarity pair and compare the low end.
Web Audio API and the Test Tone
The Web Audio API built into modern browsers generates each test tone live. Some pages add a visualizer, a waveform like an oscilloscope trace, but it shows the signal leaving the page, not what your speakers reproduce.
Stereo Test for Left and Right Channels
A stereo test plays a tone on one side at a time. Stereophonic sound depends on the left and right channels staying separate; if Left plays from your right, the stereo imaging of every film is mirrored. The centred tone checks stereo balance on speakers or headphones. The test mic recording quality needs a quick permission prompt the first time you run it, then gives you a live read-out in seconds.
| Tone | You should hear | A fault sounds like |
|---|---|---|
| Left / Right | One side only | Both sides, or the wrong side |
| Centre | A tone in the middle | Pulled to one side (poor channel balance) |
| Polarity pair | A focused tone | Wide and thin in both versions |
| Rising tone | A smooth climb in pitch | Dead spots, rattling or buzzing |
Stereo Sound Test for Swapped or One-Sided Sound
If one side stays silent, check the cable linking the two speakers, and that you're in the green jack on a desktop PC; a worn 3.5mm jack can also make playback one-sided. If the sides are swapped, swap the speaker wires or fix the wiring at the amplifier, so your audio channels stay labelled correctly.
Frequency Sweep and Bass Speaker Tests
A frequency sweep glides one tone from the lowest to the highest pitch. Most climb logarithmically, the same number of octaves each second, so you can turn the moment a tone appears or vanishes into a frequency: The check speaker phase alignment needs a quick permission prompt the first time you run it, then gives you a live read-out in seconds.
$$f(t) = f_{0} \times \left(\frac{f_{1}}{f_{0}}\right)^{t/T}$$
Here \(f_{0}\) is the start, \(f_{1}\) the end, \(t\) the seconds elapsed and \(T\) the run length, in hertz (Hz) and seconds. Say a 16-second run climbs from 20Hz to 20kHz and you're checking a 13-inch laptop. The rumble becomes audible at 4.5 seconds, about 140Hz, and the tone fades at 15.1 seconds, about 13.6 kHz. It passes 440Hz at 7.2 seconds and 1000Hz at 9.1 seconds. Each second covers roughly 0.62 octaves, so a half-second timing slip shifts the answer by a third of an octave.
Frequency Response From 20Hz to 20kHz
Frequency response is the range a speaker reproduces and how evenly. Laptop speakers lose the bottom few hundred Hz; a sudden drop in level often marks the crossover between woofer and tweeter, and distortion, crackles or a hum at one pitch usually mean resonance in the speaker cabinet. Treble vanishing early isn't always the speaker: if headphones fade at the same second of the run, the limit is age-related hearing loss at the top of your hearing range, so take a hearing test before blaming your audio equipment.
Bass Test and Treble Test Limits
A bass test holds low frequencies, often 100Hz and below, to check a subwoofer for rattle; a treble test plays high frequencies to catch hiss. A mono test sends identical sound to both sides to show whether one driver is weaker. If the low end sounds muffled, check that an equalizer preset or bass boost hasn't been switched off, then compare with music you know.
Speaker Polarity Test With Test Tones
Speaker polarity is about wiring. Each cable has a positive and a negative lead; reverse one pair and the cones move in opposite directions. A polarity test plays one low tone twice: in phase, then with one side inverted.
In Phase vs Out of Phase
Sit in a triangle formation with both speakers, since good speaker placement makes the difference easy to hear. The normal version should feel solid; the out of phase version sounds wide and hollow because the sound waves partly cancel in the room. If the inverted one sounds fuller, a speaker is wired backwards; swap the red and black leads on one side.
Matching a Desk Subwoofer Crossover With an Online Speaker Test
I'm wiring a pair of second-hand passive bookshelf speakers to a small amplifier, with an 8-inch subwoofer under the desk. The question is simple: where should the subwoofer's crossover dial sit so nothing goes missing between the sub and the bookshelves? The answer turned out to be 100Hz, not the 80Hz the dial shipped at, because these speakers only start playing at about 92Hz. The left/right, polarity and rising tones on this page are how I measure that.
The order matters. Left and Right land on the correct sides first time. Then the polarity pair: the inverted version sounds fuller than the normal one, which means one speaker is wired backwards. I swap the red and black leads on the right speaker and replay; now the normal version is the solid one. I do this before measuring anything else, because reversed polarity cancels low notes between the speakers and would push the starting point of the next check higher than it really is.
With the sub switched off, I play a 24-second logarithmic sweep from 20Hz to 20kHz and watch a stopwatch. A clear rumble arrives at 5.3 seconds. Plugging that into the formula: 20 × 10005.3/24 ≈ 92Hz. I cross-check with a steady tone from the tone generator: 90Hz is faint but present, 80Hz is barely there. Since my stopwatch thumb is the weak link, I solve for the times either side:
| Rumble heard at | Frequency |
|---|---|
| 5.0 s | 84Hz |
| 5.3 s | 92Hz |
| 5.6 s | 100Hz |
Measured against the 80Hz crossover THX recommends for home systems, that leaves a gap between 80Hz and about 92Hz where neither box carries the note. Even the late end of my timing range lands at 100Hz, so I set the dial there and rerun the sweep with the sub on: the rumble now starts almost immediately and stays even through the handover, which confirms the gap is closed.
One caveat a spec sheet won't give you: at a desk, room reflections can cancel a single low note at your head. I moved back 40cm and repeated the run; the start moved by only 0.2 seconds, so this was the speakers, not the room. Had it jumped by half a second or more, I'd trust the room, not the speaker, and fix seating before touching the dial. The input I'd watch most is that start time, since each second here spans only 0.42 octaves.
Tone Generator, Sine Wave and Noise in a Sound Tester
A tone generator plays a steady pitch you choose, such as 440Hz (concert A) or 1000Hz, to find one buzzing panel or match two speakers. A spectrum analyzer paired with a microphone shows which frequencies your speakers actually put out during a tone, capped by its sample rate: a capture taken 48,000 times a second stops at 24 kHz.
White Noise vs Pink Noise
The white kind spreads equal energy across every hertz and sounds like bright hiss. Pink noise puts equal energy in each octave, closer to how your ears judge loudness, so installers use it to calibrate a system and some owners play it for speaker burn-in.
Phone Speaker Test Online for iPhone, Android and Earbuds
On an iPhone or Android handset, expect a thin low end and treat a phone speaker as mono unless the model has stereo drivers. Tones follow the system output, so a paired Bluetooth headset, earbuds or AirPods take over. Check speech clarity across the voice range: a muffled voice on calls can be the microphone, so run a microphone test too. Two-channel tones can't check 5.1 surround sound.
Headphone Test and Speaker Cleaning
A headphone test uses the same left/right logic at lower levels. If a phone speaker sounds distorted after getting wet, a speaker cleaning tone vibrates water out of the grille; replay the tones to confirm the fix.
Audio Check When You Hear No Sound
Work through this audio check from the quickest fix to the most involved.
Volume, Output Device and Safe Levels
- Pick the right output device, or playback device, in sound settings on Windows or macOS; HDMI monitors often grab it.
- Check the speakers are powered on and no mute key is active.
- Start at a low volume, about a quarter of maximum, and raise it slowly.
Audio Driver and Sound Card Fixes
If nothing plays anywhere on the computer, update the audio driver from your sound card or motherboard maker and restart. Faulty hardware is the last suspect, not the first.
When the Audio Test Passes but an App Stays Silent
If this audio test plays but Zoom or YouTube stays quiet, your audio gear is fine and the problem is software. Check the volume mixer on Windows or per-app volume on a Mac, the tab's speaker icon and the app's output choice, and close programs holding the device. A pass here only proves the browser path; it can't see settings inside other apps.
Frequently Asked Questions
- What can I use this tone generator for?
- This tool lets you generate pure audio tones to test speakers and headphones for stereo balance, phase issues, and resonant frequencies. It's also useful for tuning instruments to a reference pitch, testing your hearing sensitivity across frequencies, and diagnosing audio equipment problems.
- What's the difference between a Speaker Test and a Headphone Test?
- A speaker test checks your room's acoustic environment along with the speaker's stereo balance and frequency response. A headphone test focuses on left/right channel isolation and in-ear frequency accuracy. Use the channel selector in this tool to isolate left or right output for either test type.
- What is the safe volume level to use?
- Start with a comfortable volume at a reference frequency like 1,000 Hz and avoid increasing it significantly when testing other frequencies — especially high ones where your hearing is most vulnerable. Prolonged exposure to loud tones, even if you can barely hear them, can damage hearing and equipment.
- Why is the resonant frequency of a speaker important?
- Every speaker has a resonant frequency (Fs) at which it vibrates most efficiently. Playing a tone at this frequency helps you identify the speaker's natural resonance point. Knowing this is essential for subwoofer box design, enclosure tuning, and ensuring your speaker isn't being driven outside its optimal range.
- How do I find the resonant frequency of my speaker?
- Start at a low frequency (around 20–40 Hz for subwoofers) and slowly sweep upward. The resonant frequency is where the cone excursion (movement) is greatest and you may notice a change in perceived loudness. This corresponds to the Thiele/Small parameter Fs.
- What are the different waveform types and when should I use them?
- Sine waves are pure tones with no harmonics — ideal for precise frequency testing. Square waves contain strong odd harmonics and stress tweeters more. Sawtooth waves have the richest harmonic content and are good for full-range speaker stress tests. Triangle waves are smoother than square waves and useful for mid-range checks.
- Are the test results accurate?
- The tone is generated using the Web Audio API at a sample rate of 44.1 kHz, which ensures excellent accuracy across the audible spectrum. However, actual sound output quality depends on your device's audio hardware, drivers, and speaker/headphone quality.
- Can I use this speaker test on mobile?
- Yes. The tool runs entirely in your browser using the Web Audio API and is compatible with modern versions of Chrome, Firefox, Safari, and Edge on both desktop and mobile. Make sure your device's volume is set to a safe level before playing any tones.