Abstract
The system need to define a low-frequency extend frequency, a quality and quantity ratio and radius of a port. Also, the resonance frequencies of a mechanical system and the quality and quantity of a mechanical system are fixed to obtain the parameters for the radius of the port, the length of the duct, and the cavity inside the device, etc. Thereby, the optimal design of a bass-enhanced loudspeaker enclosure for any kind of loudspeakers can be efficiently established.