20 - 20,000 Hz Audio Sweep | Range of Human Hearing Sonic Electronix 0:36 8 years ago 5 406 748 Скачать Далее
20Hz to 20kHz Frequency Sweep (Logarithmic) 1080p HD Aaron Shannon 0:41 9 years ago 274 215 Скачать Далее
20kHz to 20Hz Frequency Sweep - Audio Signal Test - Human Audible Spectra GMODISM 2:56 5 years ago 87 060 Скачать Далее
20Hz to 20kHz | 5.1 Dolby Test | Hearing and Deep Bass test 4K 5.1 Test & Clips 3:17 9 months ago 38 012 Скачать Далее