 The temple's name came after the famous "Yongle" Big Bell that is housed inside the temple, which was cast during the reign of the Yongle Emperor (1403-1424) of the Ming dynasty (1368-1644).According to a test by the Chinese Academy of Sciences, the Yongle Big Bell's sound could reaches up to 120 decibels and can be heard 50 kilometers away from the temple in the depth of night.Many music experts, including some from the Chinese Acoustics Institute have found its tone pure, deep and melodious with a sprightly rhythm.