Test your speakers by playing different tones and sounds. Adjust frequency and waveform to verify audio output quality.
Start with a low volume and gradually increase. The default 440 Hz tone is a standard A4 note.
Use the Left/Right channel buttons to verify that both speakers are working correctly.
Try different waveforms — sine is smooth, square is buzzy, sawtooth is harsh, triangle is mellow.
Speakers convert electrical signals into sound waves through electromagnetic induction. An electrical current flows through a coil (voice coil) surrounded by a permanent magnet. This creates a varying magnetic force that moves a cone (diaphragm) back and forth, pushing air molecules to create sound waves. The frequency of the electrical signal determines the pitch, while the amplitude determines the volume.
Sine waves produce the purest, most natural tone — a single frequency with no harmonics. Square waves sound buzzy and hollow, containing only odd harmonics. Sawtooth waves are bright and harsh, containing both odd and even harmonics — widely used in synthesizers. Triangle waves are similar to sine waves but slightly brighter, with weak odd harmonics.
The typical human hearing range is 20 Hz to 20,000 Hz. Bass frequencies (20-250 Hz) are felt as much as heard. Mid-range (250-4,000 Hz) covers most speech and musical instruments. Treble (4,000-20,000 Hz) adds brilliance and clarity. Hearing sensitivity decreases with age — most adults can't hear above 15,000 Hz. This test's frequency slider covers the full audible spectrum.
This test uses the Web Audio API to generate tones directly in your browser. An OscillatorNode generates the waveform at your chosen frequency, connected through a GainNode for volume control. Channel routing uses ChannelSplitter and ChannelMerger nodes to direct audio to specific left/right speakers. All processing happens client-side — no audio is transmitted anywhere.
First, make sure your system volume is turned up and not muted. Check that the correct audio output device is selected in your OS settings. Some browsers require user interaction before playing audio — try clicking the Play button again. If using headphones, ensure they're properly connected.
If both channels sound identical, you may be using a mono speaker or your audio output is configured in mono mode. Check your audio settings. With stereo speakers or headphones, you should clearly hear the sound from only one side when testing individual channels.
White noise contains all frequencies at equal intensity and is useful for testing the full frequency response of your speakers. It can also reveal issues like rattling, distortion, or frequency gaps that single tones might miss. It's also commonly used for sleep therapy and focus enhancement.