Descending sine sweep, 20 kHz to 20 Hz
The same full-range sweep played top to bottom.
Volume first. Turn your device volume down before pressing play, then raise it slowly. Tones start quiet on purpose. High-frequency tones can seem silent and then turn painfully loud when volume goes up. Never raise the volume just because you hear nothing. Very low tones can damage small speakers and woofers if pushed hard. Stop if you hear rattling, distortion or cone slap.
The WAV is rendered on your device at 48 kHz, 16-bit stereo, using the settings above, so you can play it from a USB stick, a TV or measurement software.
What to listen for
Starting high makes the first audible moment a quick hearing check, and ending in the bass leaves your ears fresh for spotting rattles and room boom at the end.
Every other range, including custom start and end points and presets, is on the main frequency sweep generator.
Other sweeps
Questions people ask
How long does each octave take in this sweep?
This sweep covers 10.0 octaves. With the default 20-second logarithmic setting, each octave takes about 2.0 seconds. In linear mode the top octave would take half the total time.
Can I download this sweep?
Yes. Press "Download WAV" to render it on your device as a 48 kHz, 16-bit stereo file, using whatever duration, waveform, level and channel you have set.
Keep testing
- Frequency sweepLogarithmic or linear sweeps over any range and duration.
- Spectrum analyzerReal-time FFT of your microphone with peak hold and note readout.
- Room mode calculatorPredict booming bass notes from your room size.