Reference sines, sweeps, and channel-identification files - 16-bit / 44.1 kHz WAV, 30 seconds, -6 dBFS. Rendered losslessly in your browser the moment you click, so every file is sample-exact. Free for any use.
30-second sines at -6 dBFS, the standard level for line-up tones.
Exponential sweeps with fade-in/out - the fastest full-range speaker check.
Stereo files for wiring checks - which speaker is which, and is polarity right.
For arbitrary frequencies, live adjustment, or listening rather than downloading, the interactive tools cover everything here and more: the tone generator plays and exports any frequency from 20 Hz to 20 kHz, the sweep generator runs configurable live sweeps, the noise pages export white, pink, brown, green, and gray noise WAVs, and the signal generator handles engineering waveforms.
All files are rendered at -6 dBFS peak (amplitude 0.5), the common line-up level - loud enough for clean measurement, with headroom to avoid any clipping in players or converters. 16-bit stereo-or-mono WAV at 44.1 kHz, 30 seconds each.
Because synthesis is lossless and instant: your browser renders the exact waveform sample-by-sample the moment you click, so there is nothing to compress, host, or trust. The file you get is mathematically identical to what any studio would render for the same spec.
It is the audio industry's reference point: aligning levels between devices (set the tone to read 0 VU / -18 dBFS on the destination), verifying signal chains pass audio cleanly, testing for distortion, and calibrating broadcast and PA systems. When someone says "send tone," they mean this.
Play the full-range sweep at moderate volume and listen for dropouts (frequencies that vanish), resonances (frequencies that boom), and rattles (buzzing from the cabinet or the room). The bass sweep does the same for the bottom octaves where room modes live - pair it with the room mode calculator to know what to listen for.
Yes - a sine wave is not copyrightable and these renders are free for any use, commercial included. If they save you time, a link back to tonal.fm is appreciated but never required.