Speaker Frequency Response Test
Find out which frequencies your speakers, headphones or laptop can actually reproduce. Play a smooth 20 Hz to 20 kHz sine sweep or step through 31 standard tones, mark when the sound appears and disappears, and get the audible range on a chart. Start with a low volume.
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Turn your device volume down before you start, then raise it slowly. Pure tones at high volume can damage hearing and small speakers.
Upward sweep: press I hear it now when the tone first appears (your low limit) and Sound is gone when it fades out at the top (your high limit). Downward sweeps work the other way round.
Each tone plays once; answer to move to the next. Click any frequency below to play it on its own.
The manual tone stops automatically after 60 seconds.
Run the sweep or the stepped test to see your audible range.
How to use the Speaker Frequency Response Test
- Turn your device volume down, then set the volume slider low. You can raise it slowly once a tone plays.
- Choose the speakers to test: both channels, or the left or right speaker on its own.
- Run the sweep: tap Start sweep and press I hear it now as soon as the tone appears, then Sound is gone when it disappears.
- Confirm with the stepped test: tap Start stepped test and answer Heard it or Not heard for each tone (keyboard: H and N).
- Read your result: the chart and summary show the lowest and highest frequency you heard. Copy the summary to compare devices.
Typical frequency ranges of speakers and headphones
Use these rough ranges to judge your result. They describe where output is still clearly audible at a normal listening level, not the optimistic numbers on spec sheets (which often quote ±10 dB or more).
| Device | Usual low limit | Usual high limit |
|---|---|---|
| Phone speaker | 200 to 400 Hz | 15 to 20 kHz |
| Laptop speakers | 100 to 250 Hz | 15 to 20 kHz |
| Small Bluetooth speaker | 60 to 120 Hz | 15 to 20 kHz |
| Bookshelf speakers | 45 to 70 Hz | 20 kHz |
| Speakers with a subwoofer | 20 to 35 Hz | 20 kHz |
| Over-ear and in-ear headphones (good seal) | 20 to 30 Hz | 20 kHz |
The high limit you measure is usually set by your hearing. Young people can hear up to about 20 kHz; the upper limit falls with age and noise exposure, and many adults stop hearing tones somewhere between 12 and 17 kHz. Test a second device: if both stop at the same frequency, it is your ears, not the speakers.
How the sweep and stepped tones are generated
All sounds are pure sine waves created in your browser with the Web Audio API, at the same digital level for every frequency. The sweep is logarithmic (exponential): the frequency at time t is f(t) = fstart × (fend / fstart)t / T, where T is the sweep length, so every octave takes the same time. A 30-second sweep from 20 Hz to 20 kHz covers almost 10 octaves at about 3 seconds per octave.
Your reaction takes roughly a quarter of a second, during which a fast sweep moves on. With Compensate reaction time switched on, the marked frequency is taken from 0.25 s before your tap. For the most precise limits, confirm them with the stepped test or the manual tone, which hold a single frequency steady.
The stepped test uses the 31 preferred 1/3-octave frequencies (20, 25, 31.5, 40 … 12.5k, 16k, 20k Hz). Each step is a factor of 21/3 ≈ 1.26 higher than the last.
Tips for an accurate speaker test
- Turn off equalisers, bass boost, "spatial" or "enhancement" effects in your system or player first; they change the response you measure.
- Use a moderate, fixed volume for all tests you want to compare. Louder playback makes faint frequencies audible and widens the range.
- Room position strongly affects bass: speakers near a wall or in a corner produce more low end. Sit where you normally listen.
- If you hear rattling or buzzing at low frequencies, lower the volume: that is the speaker or a loose object vibrating, not the tone.
- Test the left and right speakers separately to catch a damaged or blown driver on one side.
Frequently asked questions
What does a speaker frequency response test show?
It shows the range of frequencies your speakers or headphones can reproduce at a level you can hear. Small laptop and phone speakers often fade out below 100 to 200 Hz, while good headphones and speakers with a subwoofer reach 20 to 40 Hz. The top of the range is usually limited by your own hearing rather than the speaker.
Is this test measuring my speakers or my ears?
Both. You hear the result through your ears, so the highest frequency is mostly limited by your hearing, which drops with age (many adults do not hear above 14 to 17 kHz). The lowest frequency is mostly limited by the speaker. Testing two devices with the same ears lets you compare them fairly.
Is the frequency sweep safe for my speakers?
At a moderate volume, yes. Pure tones concentrate all the energy in one frequency, so avoid high volume, especially for very low bass on small speakers and high treble on tweeters. Start low, raise the volume slowly and stop if you hear rattling or distortion.
Why do low tones sound like buzzing or a higher note?
A small speaker that cannot move enough air at a very low frequency produces harmonics (distortion) at 2, 3 or 4 times the frequency instead. What you hear is then a higher tone or a buzz. For an honest low limit, mark the point where the pure, smooth tone disappears, not where the buzz stops.
Why do some frequencies sound much louder than others?
Every speaker and room has peaks and dips in its response, and human hearing is most sensitive between about 2 and 5 kHz. The test plays every tone at the same digital level, so loudness differences you hear come from the speaker, the room and your ears.
What is the 1/3-octave stepped test?
It plays the 31 standard 1/3-octave centre frequencies used in audio equalisers and measurements (from ISO 266), from 20 Hz to 20 kHz. Each step is about 26% higher than the previous one, so the steps sound evenly spaced to the ear.
Why does the sweep take so long in the bass?
The sweep is logarithmic: it spends the same time on every octave. 20 to 40 Hz gets as much time as 10 to 20 kHz, which matches how we hear pitch and gives you time to react at both ends.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.