The sound of swiftlet is one of the most important keys to attracting new birds in modern times. If the sound of swiftlet is well controlled, you will see many bird keep hitting the speakers and cling to the speakers in groups like taken stimulants.
Today we will not talk about how to adjust the bass & treble, frequency response, speakers and amplifiers, let’s take a look at the volume reading and impact of sound loudness level.
The following video is in Chinese (Sorry, only Chinese video available now)
I hope that after watching, you can get an overview of the internal sound and the key points of volume control