A motor vehicle ((10; 100) defining a central longitudinal axis along which the motor vehicle (10; 100) is intended to move, one front side along the longitudinal axis, and a median plane of the motor vehicle (10; 100), the median plane including the longitudinal axis and being vertical when the motor vehicle (10; 100) is on a horizontal surface, the motor vehicle (10; 100) comprising: - a structure comprising a bulkhead, - at least one front seat intended to seat a driver of the motor vehicle (10; 100), - a floor covering, the bulkhead and the floor covering partially delimiting a passenger compartment of the motor vehicle (10; 100), and - a sound system including at least one speaker enclosure (42; 142; 242; 342) rigidly attached to the structure, the speaker enclosure (42; 142; 242; 342) comprising: - one box (46; 146; 246; 346) defining at least one first opening, and - at least one first woofer mounted in the opening, the speaker enclosure (42; 142; 242; 342) being located close to the median plane: - either longitudinally between the bulkhead and a front edge of the front seat, - or longitudinally astride a front zone of the passenger compartment intended to receive the driver and a rear zone of the passenger compartment intended to receive one or more rear passengers of the motor vehicle (10; 100), characterized in that the box is intended to form a universal support, and wherein: - the box further defines a second opening, the speaker enclosure further comprising a second woofer structurally analogous to the first woofer, the second woofer being mounted in the second opening, back-to-back with the first woofer, and/or - the box defines at least one or two additional opening(s) (348A, 348B), the speaker enclosure further comprising at least one or two passive membrane(s) (350A, 350B) which are mounted as to be movable relative to the box in the additional opening or openings (348A, 348B) respectively, the passive membrane or membranes (350A, 350B) being apt to emit the sound waves (352A, 352B). - a structure comprising a bulkhead, - at least one front seat intended to seat a driver of the motor vehicle (10; 100), - a floor covering, the bulkhead and the floor covering partially delimiting a passenger compartment of the motor vehicle (10; 100), and - a sound system including at least one speaker enclosure (42; 142; 242; 342) rigidly attached to the structure, - one box (46; 146; 246; 346) defining at least one first opening, and - at least one first woofer mounted in the opening, - either longitudinally between the bulkhead and a front edge of the front seat, - or longitudinally astride a front zone of the passenger compartment intended to receive the driver and a rear zone of the passenger compartment intended to receive one or more rear passengers of the motor vehicle (10; 100), - the box further defines a second opening, the speaker enclosure further comprising a second woofer structurally analogous to the first woofer, the second woofer being mounted in the second opening, back-to-back with the first woofer, and/or - the box defines at least one or two additional opening(s) (348A, 348B), the speaker enclosure further comprising at least one or two passive membrane(s) (350A, 350B) which are mounted as to be movable relative to the box in the additional opening or openings (348A, 348B) respectively, the passive membrane or membranes (350A, 350B) being apt to emit the sound waves (352A, 352B).