Online Audio Tone Generator & Frequency Sweeper – 1Hz–20kHz Sine, Square & Subwoofer Test
Idle
Waveform:
Hz
20%
Center
Frequency Sweep Diagnostic
From:
Hz
To:
Hz
Duration:
How Web Audio Tone Generation Works
Modern web browsers feature hardware-accelerated audio synthesis via the AudioContext API. Using high-resolution internal clock timing, this generator calculates direct mathematical waveforms (Sine, Square, Triangle, and Sawtooth) at 44.1kHz or 48kHz DAC sampling rates without audio buffer degradation or MP3 compression artifacts.
Practical Applications
- Subwoofer & Room Mode Resonance: Sweep low frequencies between 20Hz and 80Hz to locate bass nulls, acoustic room rattles, and crossover points.
- Hearing Threshold Screening: Test upper-frequency human hearing response (typically dropping from 20kHz toward 14kHz–16kHz with age).
- Stereo Channel Polarity & Balance: Pan pure 1kHz calibration tones between left and right channels to verify monitor gain symmetry.
Frequently asked questions
Is a sine wave or square wave better for testing speakers?
A pure sine wave is ideal for identifying room rattles, distortion harmonics, and frequency cutoffs without harmonic overload. Square waves produce rich odd-order harmonics.
Why does the audio start with a smooth volume fade?
The generator applies an exponential ramp curve to prevent harsh speaker pops and protect delicate headphone drivers.
Audiophile studio monitors & reference DACs
Explore Studio MonitorsExperience zero-distortion flat frequency response with professional studio monitors and audio interfaces.
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