Frame for a loudspeaker cabinet comprising a connection device for connecting to another loudspeaker cabinet, said connection device comprising a eyelet and a locking system, said locking system comprising: - two legs, which are a front leg and a back leg, disposed parallel to each other and each comprising a lower aperture and an upper aperture; - a slide disposed between the two legs (31a; 31b) and configured to slide between a high position and a low position, the slide comprising an opening having at least one wide portion and at least one narrow portion, and being provided with two guide members, each bearing on an edge of at least one of the two legs (31a;31b) on opposite sides of the leg; - at least one spacer linking the two legs (31a; 31b) to each other; - a first elastic member connected to said slide and configured to bring the slide automatically from the high position to the low position; - a selecting screw comprising a shaft having at least one wide section and at least one narrow section, the shaft of the selecting screw passing through the upper aperture of each of the legs (31a; 31b) and the opening of the slide, and being configured to move between a returned position in which the at least one wide section of the shaft is inside the opening of the slide and a moved away position in which the at least one narrow section of the shaft of the screw is inside the opening of the slide; - a second elastic member connected to the selecting screw and configured to return the selecting screw automatically from the moved away position to the returned position; - a locking member comprising a locking shaft configured to take a locking position in which the locking shaft passes through the lower aperture of each of the two legs (31a; 31b) and an opening position in which the locking shaft frees at least partly a space defined between the two legs (31a; 31b); - an actuator configured to take a pulled position and a pushed position and joined to the selecting screw and to the locking shaft, said locking system being configured to take a locked configuration wherein: - the slide is in high position; - the selecting screw is in returned position in which the wide section of the shaft is inside the wide portion of the opening of the slide; and - the locking shaft is in locking position; and a cocked configuration in which: - the slide is in low position; - the selecting screw is in moved away position in which the narrow section of the shaft is inside the opening of the slide; and - the locking shaft is in opening position, the locking system passing from the locked configuration to the cocked configuration by movement of the actuator and from the cocked configuration to the locked configuration by movement of the slide from the low position to the high position. - two legs, which are a front leg and a back leg, disposed parallel to each other and each comprising a lower aperture and an upper aperture; - a slide disposed between the two legs (31a; 31b) and configured to slide between a high position and a low position, the slide comprising an opening having at least one wide portion and at least one narrow portion, and being provided with two guide members, each bearing on an edge of at least one of the two legs (31a;31b) on opposite sides of the leg; - at least one spacer linking the two legs (31a; 31b) to each other; - a first elastic member connected to said slide and configured to bring the slide automatically from the high position to the low position; - a selecting screw comprising a shaft having at least one wide section and at least one narrow section, the shaft of the selecting screw passing through the upper aperture of each of the legs (31a; 31b) and the opening of the slide, and being configured to move between a returned position in which the at least one wide section of the shaft is inside the opening of the slide and a moved away position in which the at least one narrow section of the shaft of the screw is inside the opening of the slide; - a second elastic member connected to the selecting screw and configured to return the selecting screw automatically from the moved away position to the returned position; - a locking member comprising a locking shaft configured to take a locking position in which the locking shaft passes through the lower aperture of each of the two legs (31a; 31b) and an opening position in which the locking shaft frees at least partly a space defined between the two legs (31a; 31b); - an actuator configured to take a pulled position and a pushed position and joined to the selecting screw and to the locking shaft, - the slide is in high position; - the selecting screw is in returned position in which the wide section of the shaft is inside the wide portion of the opening of the slide; and - the locking shaft is in locking position; - the slide is in low position; - the selecting screw is in moved away position in which the narrow section of the shaft is inside the opening of the slide; and - the locking shaft is in opening position,