1:00 5000 Hz Test Tone 0:28 Тест на слух до 6000 Hz 0:36 25 - 150 Hz Audio Sweep 0:36 20 - 20,000 Hz Audio Sweep | Range of Human Hearing 1:03 5000 hz 10:05 5000 Hz clean pure sine wave TEST TONE 5 khz frequency 2:24 20Hz to 20kHz (Human Audio Spectrum) 1:02 5000 hz square