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Speaker and headphone test online

Play sine, square, triangle and sawtooth waves, white noise and pink noise, and check left/right channels

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Press Play to see the spectrogram

Frequency axis

Logarithmic scale: every octave (frequency doubling, for example 100, then 200, then 400 Hz) takes the same height. Your ears judge pitch by ratio like this, so musical notes are evenly spaced on screen. Bass and mids get plenty of room to tell apart, while everything above 10 kHz is squeezed. To see where a compressed file cuts off its top end, switch to Linear.

The horizontal axis is time (newest on the right), the vertical axis is frequency, and the hotter the colour (dark blue, cyan, yellow, red) the louder the sound at that frequency.

Waveform
Frequency
Hz
Channel
Volume

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A tool that plays test signals (sine, square, triangle, sawtooth, white noise, pink noise) through whatever speaker or headphone you are currently using, with left/right channel selection and phase inversion, so you know your listening gear is behaving correctly before you judge a separated track or a mix.

Why test your speakers or headphones before judging a separation or a mix?

Your ears are easily fooled by the device they are listening through: a headphone weak in the high end can make a separated track sound cleaner than it really is, and a speaker with an imbalanced channel can make you misjudge a mix. Playing a known reference signal (a 1kHz sine, white noise…) and checking it sounds the way it should is the fastest way to rule out the headphone or speaker before blaming the file.

What is the difference between sine, square, triangle and sawtooth?

These four waveforms differ only in shape and how rich they are in harmonics. A sine wave is pure, a single frequency, useful for hunting down one specific resonance or checking whether one exact band comes through cleanly. Square, triangle and sawtooth all carry extra harmonics at multiples of the base frequency, each in a different ratio, so they sound harsher than a sine and are useful when you want a signal with more energy higher up to probe a tweeter.

What are white noise and pink noise used for?

White noise carries equal energy at every frequency, which sounds harsher toward the high end because human hearing is more sensitive there. Pink noise is filtered so its energy tapers off as frequency rises, which sounds more balanced and natural to human ears, making it the more common choice for measuring a speaker's frequency response or checking a system's tonal balance.

Why is the frequency axis different from the Spectrogram tool?

The two pages answer different questions, so they space the axis differently. The Spectrogram tool uses a linear scale because its main job is inspecting the high end: compressed files such as MP3 usually cut everything above some frequency (around 16 to 17 kHz at 128 kbps, close to 20 kHz at 320 kbps), and a linear scale makes that boundary obvious. This page defaults to a logarithmic scale because you choose the frequency yourself anywhere from 20 Hz to 20 kHz: every octave (a doubling of frequency) takes the same height, which matches how your ears perceive pitch, so 50 Hz, 440 Hz and 5 kHz all get room to be seen. The cost is that everything above 10 kHz is squeezed. You can switch between the two at any time.

What is the right-channel phase-invert switch for?

If one speaker in a pair is wired with reversed polarity (+/- swapped), the bass and any content shared between the two channels will partially cancel instead of reinforcing, leaving the stereo image thin and the bass weak even though each speaker sounds fine on its own. Turn on the phase-invert switch while playing the same signal on both channels: if the bass suddenly sounds thinner and noticeably different from with it off, one of the two speakers is likely wired out of phase.

Who should use this speaker and headphone test?

  • Anyone who just separated or mixed a track and wants to confirm their headphones or speakers are behaving before judging the result
  • Anyone who just bought speakers or headphones and wants a quick check of left/right channels and frequency range
  • Anyone who suspects one speaker in a pair is wired out of phase
  • Audio learners who want to hear the actual difference between sine, square, white noise and pink noise

More to read

Left/right audio imbalance or a missing channel: a diagnostic guide

Diagnose a quiet side, missing channel, misplaced content or phase clues with L/R views, level measurements and mono checks with explicit limits.

Read more →

Left and right speaker and headphone test: how to check

Test left and right speakers and headphones in your browser: play each channel, spot swapped or unbalanced channels, a dead side, and fix it fast.

Read more →

Speaker polarity test: check for out-of-phase wiring

Check if a speaker is wired out of phase with a low sine and a phase-invert switch: thin or full bass tells you if the pair is right, and how to fix it.

Read more →

How many Hz can you hear? A sine hearing range test

Test your hearing frequency range with sine tones from 20 Hz to 20 kHz in the browser, and learn why the top end fades with age and gear.

Read more →

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