Test speakers, headphones and audio equipment with a free online frequency tone generator. Set any frequency from 20 Hz to 20 kHz, choose a waveform, adjust volume and send sound to both ears or one channel. Preset frequencies make common tests quick, while the 20 Hz to 20 kHz sweep can help identify frequency response issues in speakers and rooms. https://aitoolspros.com/tools/audio/tone-generator/