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.

Speaker Test

The Speaker Test plays three separate test tones — Low (200 Hz), Mid (1000 Hz), and High (4000 Hz) — so you can confirm every driver in your speakers or headphones actually works, not just that some audio is playing. Pick your output device, click each button to hear its tone through your woofer, midrange, and tweeter, and use the Volume slider to keep it comfortable. A dead or swapped driver usually only shows up on one frequency, so testing all three separately catches problems a quick song wouldn't. 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.

Ever plugged in a new pair of headphones or finished setting up a surround sound system only to wonder — is everything actually working as it should? The Speaker Test tool above gives you instant confirmation that your audio output is functioning correctly, channel by channel, frequency by frequency — all inside your browser, with zero uploads, zero sign-up, and zero guesswork. Whether you're chasing a missing bass line, suspecting one ear is quieter than the other, or simply want peace of mind before a recording session, this free online sound testing tool puts professional-grade diagnostics in your hands in seconds.

Test Your Speakers Online with an Online Tone Generator – Quick Sound Check

This tool is a browser-based audio testing suite built entirely on the Web Audio API — meaning all sound is generated and processed locally in your browser via browser audio. Your signal never leaves your device, making it 100% private and 100% local. There are no plugins to install, no installs required, no sign-up, and nothing is ever uploaded to a server. It works as a complete audio check for any setup, from laptop drivers and earbuds to dedicated hi-fi systems and studio monitors. The microphone record test needs a quick permission prompt the first time you run it, then gives you a live read-out in seconds.

Speaker or Headphone Test — Checking Frequency Response and Channel Balance

The core speaker test and headphone test modes run a stereo balance check and a full frequency sweep from 20Hz to 20kHz across your playback gear. You can isolate the left channel or right channel independently to confirm both drivers are functioning and delivering equal output. For headphones, the tool also supports 8D spatial audio and burn-in sequences. Over-ear cans and closed-back earphones benefit most from the channel isolation features, while this diagnostic is optimised for desktop monitors, studio references, and home audio setups. The tool offers strong browser compatibility with Chrome, Firefox, Safari, and Microsoft Edge — including iOS Safari and Android Chrome on mobile. If no sound plays, check that your tab is not muted, that the correct output device is selected in your OS, and that browser permissions allow playback. Try Chrome first, as it has the broadest Web Audio API support.

Quick Sound Test — Verifying Audio Output in Under a Minute

A quick sound check confirms your playback output is active before you dive into more advanced diagnostics. Simply hit Play and listen for the 1000 Hz tone or any reference pitch. Switch between Left, Stereo, and Right to verify your channel balance instantly. This is the fastest way to rule out basic connectivity issues — a dead output device, a muted tab, or an OS level setting that's dropped to zero. The test runs entirely client-side, using the web client's native AudioContext and oscillator node, which operate at full precision. Accuracy depends on your sound card and drivers, but for practical sound testing and speaker evaluation purposes, the results are reliable enough for everyday use and for studio engineers working on calibration tasks.

Surround Sound Test — Verifying 5.1 and 7.1 Channel Layouts

If you've just configured a 5.1 channel or 7.1 home cinema system, the surround sound test lets you fire each channel independently — front left, front right, centre, surround channel, rear channel, and subwoofer — to confirm correct placement and wiring. Imagine this scenario: you've just set up a new 5.1 system and want to confirm every driver fires before settling in to watch a film. Running this check takes under two minutes and immediately reveals any swapped cables or misconfigured receiver outputs. This kind of channel positioning verification is something even experienced home theater enthusiasts overlook.

Bass Test — Low Frequency Check for Your Subwoofer

The bass test generates deep, sub-bass tones to evaluate your subwoofer's output and reveal how low your system can actually go — useful when you want to know how low subwoofer extension truly reaches. Small laptop drivers and earbuds typically roll off below 100Hz, so if you hear nothing during the bass test, that's expected — not a fault. For dedicated subwoofer setups, the bass test doubles as a practical deep-range check: sweep down slowly and note the point where output drops away. A home theater enthusiast, for example, might use the bass tone generator to probe the natural resonance of their subwoofer placement, then physically reposition the cabinet to achieve optimal low-end response and eliminate bass frequencies that were previously being swallowed by room acoustics.

How to Run the Tone Generator and Speaker Test — Step-by-Step Instructions

Running an accurate audio check requires a little preparation. Follow these steps to get reliable results and protect your hearing and gear. The hearing test online needs a quick permission prompt the first time you run it, then gives you a live read-out in seconds.

Set volume levels first: Before you play any tone, reduce your system level to a comfortable, moderate setting — roughly 60–70% of maximum. You can damage hearing or damage speakers if you play tones at extreme volumes. This is especially critical in the high range, where sensitivity is most fragile. Loud signals can cause equipment damage and lasting auditory harm with even a single brief exposure.
Select your test type: Choose from speaker test, headphone evaluation, surround check, bass test, tone generator, binaural beats, hearing assessment, or spectral analyzer depending on your goal.
Play the tone and listen: Click Play (or press Space on the tone generator) to play a constant tone. Listen carefully for the output and note whether it sounds balanced, full, and free from coloration.
Adjust frequency as needed: Use the slider to adjust the pitch smoothly, or use the arrow key on your keyboard to increment by 1Hz at a time. Press the Shift key simultaneously to change by 10Hz per step. To halve (go down one octave) or double (go up one octave), use the dedicated octave buttons.
Stop and compare: Use the stop button between tests. Mix tones by opening multiple tabs if you want to compare or combine signals.

Volume Levels — Protecting Your Hearing and Audio Equipment

The single most important step before any audio test is setting a safe level. Always turn your system down to a reasonable level before playing our sound files. A practical benchmark: set the output to a comfortable level while listening to music, then do not stray significantly above that level even if you can't perceive much at extreme ranges. The human auditory span covers roughly 20 Hz to 20kHz — tones below 20 Hz and above 10,000 Hz are increasingly difficult to detect, which tempts users to push the volume level higher. This is dangerous. Those harmful currents and harmful output levels can mechanically stress your loudspeaker and permanently reduce your auditory sensitivity. Keep it low.

Environment and Speaker Positioning — Room Acoustics Matter

For the most accurate stereo evaluation, sit equidistant from your two drivers in a triangle formation — a classic arrangement that provides even left-right perception and accurate localization. Rooms with soft furnishings such as carpets, curtains, and sofas absorb reflections and reduce room acoustics interference, making it far easier to detect anomalies in your system's fidelity. Avoid testing in bare, reflective rooms where standing waves will colour the low-end and muddy the results. For desktop monitors, position them at ear height and angled slightly inward. This simple step dramatically improves how your brain processes auditory cues and panning information from the signals.

Tone Generator — Waveform Types, Frequency Input, and Precise Control

The tone generator is the heart of the testing suite. It generates pure tones across any pitch in the audible spectrum, sampled at a rate of 44.1kHz (CD-quality). The generator supports four signal shapes — select the one that suits your test:

Sine wave — a pure tone with no harmonics; the standard for hearing assessments, tinnitus frequency matching, and calibration work. This is the cleanest oscillator output for diagnostic use.
Square wave — rich in odd harmonics; useful for testing how your playback gear handles harmonic distortion and non-linearities.
Sawtooth wave / sawtooth — contains both odd and even harmonics, producing a bright, buzzy character. This shape reveals how your drivers handle complex, harmonically dense signals.
Triangle wave / triangle — softer than the square wave; contains only odd harmonics but with lower amplitude, making it useful for intermediate signal testing.

Each shape can be selected via the waveform selection buttons. You can also share a specific pitch and pre-select a wave type by editing the URL — for example, appending ?freq=432&waveform=square to load a 432Hz square-wave instantly. This link feature is ideal for tuning instruments to a reference note or sharing reference tones with collaborators. You can also download a 10-second WAV file (uncompressed, at standard sample rate) from the tone generator for use in any player or portable device — useful for audio training sessions and capture sessions away from the web client. The tool supports increment steps of 1Hz or 10Hz, and the generator operates at the same precision as dedicated desktop signal generators.

Spectrum Analyzer — Real-Time FFT Visualization of Your Audio

The spectrum analyzer uses a Fast Fourier Transform (FFT) algorithm to convert the incoming browser audio signal into its constituent frequency components, displaying a live waveform and FFT spectrum graph in real time. This real-time display lets you see precisely which bands are active, spot coloration peaks, and identify dead spots in your driver's response curve. The live graph updates continuously during playback, giving you visual confirmation of what your ears are perceiving. For advanced users such as mix engineers and audiophile listeners, this view is invaluable for analytical listening and signal inspection. It is particularly useful for confirming a flat response curve and detecting unwanted overtones or THD anomalies in your playback chain.

Audio Troubleshooting — Fixing Common Problems When Testing Audio Equipment

If something doesn't sound right during your audio check, use the guide below to diagnose and resolve the most common issues quickly. The test your subwoofer bass response needs a quick permission prompt the first time you run it, then gives you a live read-out in seconds.

No Sound from Speakers — Default Audio Device and Browser Permissions

If you hear nothing when you play a tone, work through this checklist:

Confirm your OS level is not muted and the correct output device is selected as the default playback device.
Check the tab is not muted — a muted tab icon will appear in the tab bar.
Modern browsers require user interaction before they allow playback; make sure you have clicked a button to initiate the session.
Verify browser permissions — some settings block playback without explicit permission.
Ensure browser compatibility by updating to the latest version of Chrome, Firefox, or Safari.
If still no output, try a different web client (Chrome has the broadest Web Audio API support) or download the WAV file alternative.

Unbalanced or One-Sided Audio — Stereo Balance and Headset Balance

A musician suspecting one driver is weaker than the other is a surprisingly common scenario. Run the headphone evaluation, play Left Only, then Right Only, and listen carefully. If one side is noticeably quieter or missing entirely, the fault could be in the cable, the 3.5mm jack, or the balance slider in your operating system settings. Check your OS balance settings — it's easy for the control to drift off-centre. Also check headset balance settings in any companion app. If the imbalance is confirmed and consistent across multiple output devices, the driver itself may be at fault — useful diagnostic information before contacting the manufacturer. For monitors, check panning settings in your equalizer or driver software, and verify the l/r channel wiring at the amplifier or receiver. Phase polarity issues — where the left channel and right channel are wired out of phase — can also cause a hollow, centre-lacking image; the phase check built into this tool will reveal this.

Weak or Missing Bass — Subwoofer Resonant Frequency and Crossover Settings

Weak or missing low end has several common causes. Start by confirming your subwoofer is powered on, connected correctly, and that the crossover settings on your amplifier or AV receiver are configured so deep-range content is being routed to the correct driver. If bass sounds thin even with the sub active, use the bass test to sweep slowly down from 80Hz toward 20 Hz and listen for where output becomes inaudible or coloured. This is your woofer's practical cutoff. Room acoustics play a significant role — certain positions create reflex resonance peaks and cancellation nulls at specific bands. Moving the cabinet even a short distance can dramatically alter its output. A compliant suspension with a larger moving mass gives the woofer a lower natural vibration point, while a stiffer suspension raises it. Understanding your subwoofer resonant frequency (sometimes called Fs in Thiele Small parameters) helps you position the cabinet for optimal extension and maximum cone velocity at the right bands.

Binaural Beats Not Working — Why Headphones Are Non-Negotiable

If the binaural beats feature seems to produce no noticeable effect, the most common cause is using open drivers instead of earphones. Open drivers mix both channels in the air before they reach your ears, destroying the separation that creates the auditory illusion. You must use stereo headphones — ideally over-ear closed-backs — to ensure each ear receives a distinct, isolated signal. If you're using earphones and still perceive no beat, confirm that the L/R display shows two different pitches, set a moderate output level (too loud or too low both reduce effectiveness), and allow 3–5 minutes of continuous listening. The brain requires time to lock onto the brainwave patterns induced by the difference in base tone between the two ears. Delta waves (1–4 Hz) promote deep rest and relaxing tones, theta waves (4–8 Hz) support light mindfulness, alpha waves (8–14 Hz) encourage relaxed focus, beta waves (14–30 Hz) aid focus and concentration, and gamma waves (30–100 Hz) are associated with higher cognitive states — including the 40 Hz tones studied in Alzheimer's disease research contexts.

Symptom	Likely Cause	Quick Fix
No sound from speakers	Wrong output device, muted tab, browser permissions blocked	Select correct default playback device; unmute tab; click Play to trigger user interaction; update browser
Unbalanced or one-sided audio	OS balance slider off-centre; damaged 3.5mm jack; faulty driver	Reset balance in OS settings; inspect cable and jack; isolate L/R with headphone evaluation
Weak or missing bass	Subwoofer off/disconnected; wrong crossover settings; poor room placement	Power and reconnect sub; set crossover correctly; reposition cabinet using bass tone sweep
Binaural beats not working	Using open drivers instead of headphones; level too extreme	Switch to stereo headphones; set moderate output; allow 3–5 min listening time
Distortion or crackling	Level too high; driver pushed beyond limits; sound card issue	Reduce output level; run coloration test at lower amplitude; check playback device connections

What You Can Use This Frequency Generator and Speaker Test Tool For

This is a genuinely versatile tool that spans everything from everyday troubleshooting to advanced signal analysis. Here's an overview of the key use cases and the features that support them.

Hearing Test and Tinnitus Frequency Matching — Know Your Hearing Range

The hearing test mode plays pure tones across the 250Hz–8kHz range and helps you identify the quietest level you can detect at each pitch — essentially a simplified audiogram. Compare your sensitivity results against the standard audiometric normal range to get a rough sense of whether your perception is within expected bounds. This tool is not a medical device and cannot replace a clinical audiology assessment, but it provides a useful personal benchmark.

For anyone experiencing pure-tone ringing in the ears, the tone generator is particularly valuable. Use it for tinnitus frequency matching: slowly sweep through pitches using the slider or the arrow key until you find the tone that most closely resembles the ringing. Once you identify this, check one octave higher (double) and one octave lower (halve) to rule out octave confusion — it's easy to mix up tones that are separated by an octave. Knowing your specific ear-ringing pitch enables more targeted use of masking tones and supports frequency discrimination training. Note that tones below 20 Hz and above 10,000 Hz fall outside normal human hearing range, so if you're sweeping at the extremes and compensate output upward, be cautious — your perception is most fragile at the high end.

Binaural Beats — Brainwave Entrainment, Focus, and Wellness

Binaural beats are an auditory illusion with a growing body of neuroscience research behind them. When your left ear hears a 200Hz base tone and your right ear hears 240Hz, your brain perceives a phantom 40Hz beat — a gamma wave. Research conducted on transgenic mice by scientists at MIT investigated whether 40 Hz stimulation could reverse molecular changes associated with Alzheimer's disease. Early animal studies showed promising results, though subsequent human trials have produced more complex findings and further research is ongoing. Gamma waves in the 30–100Hz range continue to attract serious scientific interest.

For everyday wellness, these tones are widely used for mindfulness practice, focus sessions, and calming sleep tones. Delta waves support deep rest, theta waves are associated with creativity and light sleep, alpha waves with calm alertness, and beta waves with active concentration. Set a comfortable level, use stereo headphones, allow several minutes of listening, and many users report measurable improvements in their ability to enter desired mental states.

Advanced Tools and Real-Time Visualization — Spectrum Analysis and Audio Training

Beyond the basic speaker test and sound test, the suite includes a professional-grade spectral display that shows a live waveform and FFT spectrum in real time. This enables on-the-fly signal inspection at a level previously reserved for desktop software. The tool also supports frequency sweep (a sine sweep from 20Hz to 20kHz) and perceptual sweep modes for evaluating the full response curve of your playback gear. Advanced users can generate tones at specific bands — for example, a 500Hz midrange check or a 60Hz woofer kick — and observe both the auditory and visual output simultaneously. This kind of analytical listening combined with real-time graphing is invaluable for mastering engineers, broadcast technicians, and audiophile listeners performing earphone benchmarking. The tool also supports audio training tasks like THD tone generation and coloration analysis using the spectral view.

Who Uses This Tool? — Audiophiles, Engineers, Musicians, and Everyday Listeners

The range of people who benefit from online audio tests is broader than you might expect:

Audiophiles and home audio enthusiasts — verify driver response curves, check left-right balance, and confirm subwoofer performance after system changes.
Musicians and podcasters — generate reference tones for tuning instruments, check channel balance before capture sessions, and run a quick sound test before streaming or broadcasting.
Sound engineers and studio engineers — use the tone generator and spectral display for calibration, ear training, and playback evaluation before critical mixing sessions. Precise monitoring is essential, and the Web Audio API tools here meet that bar.
Gamers — verify headset balance, test channel positioning, and confirm voice chat quality before competitive play. Even a small asymmetry can impair localization and spatial perception in gaming.
Wellness practitioners — use binaural beats for mindfulness and calming rest tones. The tool supports everything from delta wave deep-sleep sessions to gamma wave focus modes.
Video callers — run a quick sound test before Zoom or Teams meetings to eliminate the "can you hear me?" problem. A thirty-second check before a call saves everyone time.
Students and researchers — run science experiments, test the natural resonance of objects like a wineglass, or explore the non-linearities of the human auditory system.

Tool / Feature	Primary Use Case	Who Benefits Most
Speaker Test (stereo balance, phase)	Channel balance, frequency response, phase polarity check	Home audio enthusiasts, engineers
Headphone Test (L/R, 8D, burn-in)	Driver balance, spatial audio, earbud evaluation and benchmarking	Gamers, audiophiles, musicians
Tone Generator (sine, square, sawtooth, triangle)	Frequency testing, calibration, tuning instruments, reference pitch	Engineers, musicians, researchers
Hearing Test	Auditory range screening, tinnitus frequency matching	Everyone; especially those with ringing-ear concerns
Bass Test / Subwoofer Test	Deep-range check, subwoofer resonant frequency finding	Home theater enthusiasts, car audio fans
Binaural Beats	Focus, mindfulness, wellness, sleep tones	Wellness practitioners, students, shift workers
Spectrum Analyzer	Real-time FFT display, coloration detection, signal analysis	Sound engineers, mastering engineers, broadcast professionals
Surround Sound Test	5.1 / 7.1 channel verification, channel positioning	Home cinema enthusiasts, AV installers

Web Audio API: The browser's native processing framework — the AudioContext and OscillatorNode interfaces power the tone generation, wave synthesis, and real-time signal inspection in this tool. No plugins, no Flash, no installs required. All processing happens locally in browser memory.
Resonant Frequency (Fs): The frequency at which a driver or enclosure vibrates most freely — where the moving mass of the cone and the suspension compliance are in balance. At resonance, cone velocity is at its maximum and impedance peaks sharply. For a subwoofer, this natural vibration point (sometimes written Fs) defines the practical lower bound of bass extension. A larger moving mass and a more compliant suspension produce a lower resonance; a stiffer suspension raises it. The reflex resonance of a cabinet (Fb) is tuned to extend output below the driver's free-air Fs.
Binaural Beats: An auditory illusion produced when each ear receives a slightly different pitched signal. The brain perceives the arithmetic difference as a phantom beat. For example, a 200Hz signal in the left ear and a 208Hz signal in the right ear produces a perceived 8Hz alpha wave beat. Requires stereo headphones.
Tinnitus: A perception of sound — often a ringing, hissing, or tone — in the absence of an external source. The tone generator can assist with pure-tone ear-ringing matching to identify the specific pitch, enabling more targeted masking and therapy approaches. This tool is not a medical device.
Spectrum Analyzer: A visual display that uses the Fast Fourier Transform algorithm to decompose a complex signal into its individual frequency components. The FFT graph shows which bands are present and at what amplitude — useful for detecting overtone coloration, response anomalies, and driver resonances.
Sample Rate: The number of samples captured or generated per second, measured in Hz or kHz. Standard playback uses 44.1kHz (44,100 samples per second) or 48kHz. The tone generator on this tool operates at the standard CD rate by default. Higher rates such as 192 kHz capture finer high-frequency detail and are available in advanced configurations.
Waveform / Wave Type: The shape of the oscillating signal over time. A sine wave is the purest form — a single frequency with no overtones. A square wave, triangle wave, and sawtooth each add different harmonic content above the fundamental, making them useful for testing how playback gear and digital-to-analog converter stages handle complex signals. A generator that supports all four types, as this tool does, provides comprehensive testing coverage.

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.