Abstract: A reflex enclosure, includes an enclosure body, a loudspeaker, a waveguide portion and a vibration unit; a rearward sound wave generated from the loudspeaker is guided 360 degree (in all directions) from the outside of the waveguide portion to the inside of the waveguide portion, and then push the vibration unit to generate vibration to generate a corresponding sound wave, thereby reducing a standing wave ratio of the rearward sound wave in a sound room to obtain a better timbre. Furthermore, the length of a rearward sound wave guiding distance can be extended, allowing the sound wave to have the effect of extending toward a low frequency compass. In addition, the rearward sound wave is allowed to compress to increase a vibration unit pushing force, thereby obtaining a better sound effect.

Abstract: A reflex enclosure, includes an enclosure body, a loudspeaker, a waveguide portion and a vibration unit; a rearward sound wave generated from the loudspeaker is guided 360 degree (in all directions) from the outside of the waveguide portion to the inside of the waveguide portion, and then push the vibration unit to generate vibration to generate a corresponding sound wave, thereby reducing a standing wave ratio of the rearward sound wave in a sound room to obtain a better timbre. Furthermore, the length of a rearward sound wave guiding distance can be extended, allowing the sound wave to have the effect of extending toward a low frequency compass. In addition, the rearward sound wave is allowed to compress to increase a vibration unit pushing force, thereby obtaining a better sound effect.

Abstract: A reflection-type sound box comprises a box body and a loudspeaker. The box body comprises an upper shell, a lower shell for correspondingly coupling with the upper shell, and a sound chamber defined by the upper shell and the lower shell jointly. The sound chamber has a reflection duct extending inward from the upper shell and a sound cup extending inward from the lower shell. The sound cup is located to cover the outside of the reflection duct, and the sound cup and the reflection duct are spaced by a predetermined distance. The loudspeaker has an outward expanded opening and the loudspeaker is mounted in the box body for generating the sounds. The upper shell can be coupled with the lower shell easily by convex/concave engagement between the sound cup and the reflection duct. Accordingly, the reflection-type sound box has space-saving, small-noise, high-efficiency, and low-cost advantages.

Abstract: A multimedia keyboard structure comprises a keyboard main body, a control circuit, an audio input device, and several audio output devices. The keyboard main body comprises a shell, a bracket engaged with the shell correspondingly, and several independent sound chambers defined by the shell and the bracket jointly. The control circuit is held in the keyboard main body. The control circuit comprises several high-pass filters, several low-pass filters, and several power amplifiers. The audio input device is held in the keyboard main body, and electrically connected with the control circuit for receiving the sounds. The audio output devices are held in the sound chambers, and electrically connected with the control circuit. Because the control circuit drives the audio output devices and the sound chambers provides the resonance effect, the present invention can provide the advantages of improving space efficiency, integrating lines, and increasing tone quality and efficiency of speakers.