The present invention relates to a sound system, and in particular, an automobile sound system, comprising: a corresponding-diaphragm woofer sound box and midrange/tweeter speakers mounted within the automobile; the number of corresponding-diaphragm woofer sound boxes is at least one, and each of the corresponding-diaphragm woofer sound boxes comprises at least one woofer speaker and at least one woofer radiator group, the woofer speaker and the woofer radiator group being provided on the box wall in the corresponding-diaphragm woofer sound box, two woofer radiator units of each woofer radiator group being provided, respectively at the front and back, corresponding to each other and being respectively mounted on the box wall of the corresponding-diaphragm woofer sound box, and the mounting plane of the two woofer radiator units being arranged coplanar, parallel, perpendicular, or oblique to the mounting plane of the woofer speaker. The present invention realizes electroacoustic conversion within the automobile by means of the corresponding-diaphragm woofer sound box and the midrange/tweeter speakers together, achieving a sound quality higher than that of higher-end automobile sound systems at a cost lower than that of the lowest-end automobile sound systems; the manufacturing process of the whole automobile is simplified, and the cost is reduced.