40 to 50 hertz. Danish Sheng V 10 has a multifunctional regulator, which can adjust the frequency of 7. 1kHz-22kHz, and the way of adjusting the low frequency can be adjusted within the range of 25hz-200Hz as required. There is also a gain controller, which can adjust the sensitivity and output power, and it is most appropriate to adjust it to 40 to 50hz. Danish Sheng belongs to the Kingdom of Denmark, which originates from the fine speaker technology of the Kingdom of Denmark, and is based on the high-end field of the world with hifi audio sound field effect.