Test bass, midrange, treble, and the wider audible spectrum with a free online tone generator. Choose any frequency from 20 Hz to 20 kHz or use convenient presets for common test points. Sine, square, sawtooth, and triangle waveforms provide different tonal characteristics, while the sweep function helps identify frequency response issues in speakers, headphones, and listening rooms. https://aitoolspros.com/tools/audio/tone-generator/