Influence of the Sound Characteristics of Loudspeaker with Resonance Tubes

Based on the principle of resonance to improve the sound intensity of loudspeaker, the effect of the sound characteristics of loudspeaker with different size of varying and constant cross-section tubes was studied by experiments. The results showed that the varying cross-section tubes are good radiators and the constant cross-section tubes of 1/4 wave length are good resonators. Air flow with sound periodically pass through varying cross-section tubes generating 137.2dB high intensity sound at 1m distance from the outlet of the tube, whereas 120dB for constant cross-section.