Sound reproduction device with enhanced low-frequency sound effect

A sound reproduction device with enhanced low-frequency sound effect, comprising:

• a tube having two ends formed respectively with a first opening and a second opening, the tube being provided therein with an accommodating space;
• a loudspeaker comprising a frame body, the frame body having a side which is adjacent to a first diaphragm thereof and peripherally fixed to the first opening, such that the frame body together with a coil and a magnetic element provided in the frame body is received in the accommodating space, and the first diaphragm together with the frame body seals the first opening;
• a resonance unit comprising a second diaphragm and a weighting element, the second diaphragm being peripherally fixed to an inner periphery of the tube, such that the second diaphragm seals the inner periphery of the tube, and a closed resonance chamber is defined in the accommodating space of the tube as between the loudspeaker and the resonance unit by the first diaphragm and the second diaphragm, wherein the weighting element is fixed at a central position of the second diaphragm;
• and
• a plate peripherally fixed to the second opening, such that the plate seals the second opening, and a closed reflection chamber is defined in the accommodating space of the tube as between the resonance unit and the plate by the second diaphragm and the plate.