調整您的音訊設備 – 重低音測試 [10 ~ 14 Hz, 15 ~ 19 Hz, 20 ~ 24 Hz, 25 ~ 29 Hz]

Here are four files useful for tuning audio systems 和 重低音 test. Some frequencies may not be reproduced properly by audio system, but these frequencies while not subsonic, may cause damages to your system if the volume setting is to high。

Track 1 – 10 ~ 14 Hz :

Track 2 – 15 ~ 19 Hz :

Track 3 – 20 ~ 24 Hz :

Track 4 – 25 ~ 29 Hz :

享受！