A modular speaker, comprising: at least an active vibrator being operated for sound generation in response to an audio signal input; at least a passive vibrator; and a module housing having a vibration cavity, wherein said active vibrator and said passive vibrator are configured to be coupled to said module housing to close said vibration cavity as a closed cavity that shares with said active vibrator and said passive vibrator, such that when said active vibrator is operated, said passive vibrator is vibrated through air vibration within said vibration cavity for auxiliary sound generator, so as to produce a point sound with full range of frequencies including treble frequencies and bass frequencies, wherein said passive vibrator comprises a vibrating element and a suspension outwardly extended from a peripheral edge of said vibrating element to an opening rim of said module housing, wherein said active vibrator and said passive vibrator are configured to be coupled at two opposite sides of said module housing respectively, such that said active vibrator and said passive vibrator are coaxially located back-to-back, wherein said vibration cavity is formed between said active vibrator and said passive vibrator, and wherein said active vibrator comprises a vibrating body, a surround configured to be outwardly extended from a peripheral edge of said vibrating body, a voice coil configured to be operatively coupled to said vibrating body for receiving said audio signal input, and an electromagnetic mechanism configured to be operative linked to said voice coil for electromagnetic induction with said voice coil characterized in that said module housing, having a hollow structure, has a main body portion and a base portion, wherein said passive vibrator is configured to be coupled to said base portion to define a second chamber, wherein said electromagnetic mechanism and said voice coil are configured to be disposed and encircled within said main body portion to define a third chamber, wherein a space between said vibrating body and said electromagnetic mechanism forms a first chamber, wherein said first chamber is configured to be communicatively linked to said second chamber through said third chamber. at least an active vibrator being operated for sound generation in response to an audio signal input; at least a passive vibrator; and a module housing having a vibration cavity, wherein said active vibrator and said passive vibrator are configured to be coupled to said module housing to close said vibration cavity as a closed cavity that shares with said active vibrator and said passive vibrator, such that when said active vibrator is operated, said passive vibrator is vibrated through air vibration within said vibration cavity for auxiliary sound generator, so as to produce a point sound with full range of frequencies including treble frequencies and bass frequencies, wherein said passive vibrator comprises a vibrating element and a suspension outwardly extended from a peripheral edge of said vibrating element to an opening rim of said module housing, wherein said active vibrator and said passive vibrator are configured to be coupled at two opposite sides of said module housing respectively, such that said active vibrator and said passive vibrator are coaxially located back-to-back, wherein said vibration cavity is formed between said active vibrator and said passive vibrator, and wherein said active vibrator comprises a vibrating body, a surround configured to be outwardly extended from a peripheral edge of said vibrating body, a voice coil configured to be operatively coupled to said vibrating body for receiving said audio signal input, and an electromagnetic mechanism configured to be operative linked to said voice coil for electromagnetic induction with said voice coil characterized in that said module housing, having a hollow structure, has a main body portion and a base portion, wherein said passive vibrator is configured to be coupled to said base portion to define a second chamber, wherein said electromagnetic mechanism and said voice coil are configured to be disposed and encircled within said main body portion to define a third chamber, wherein a space between said vibrating body and said electromagnetic mechanism forms a first chamber, wherein said first chamber is configured to be communicatively linked to said second chamber through said third chamber.