Test sound frequencies with a free online tone tool designed for speakers, headphones and audio systems. Generate tones between 20 Hz and 20 kHz using four basic waveforms and control output for both ears or individual channels. The sweep function moves through the audible spectrum in 15 seconds, making it useful for identifying peaks, dips and other response differences in playback e... https://aitoolspros.com/tools/audio/tone-generator/