A plant for manufacturing ceramic articles comprising a compacting machine for compacting a powder material comprising ceramic powder; the compacting machine comprises a compacting device, which is arranged in the area of a work station and is designed to compact the powder material so as to obtain a layer of compacted powder; a conveyor assembly to transport the powder material along a first portion of a given path in a feeding direction from an input station to the work station and the layer of compacted powder along a second portion of the given path from the work station to an output station; and a feeding assembly, which is designed to feed the powder material to the conveyor assembly in the area of the input station; wherein the feeding assembly comprises a first and at least one second feeding device (10, 11) arranged above the conveyor assembly; the first feeding device is designed to contain a powder material of a first type and comprises a respective first containment chamber having a respective first output mouth, whose longitudinal extension is transverse (in particular, perpendicular) to the feeding direction; the second feeding device is designed to contain a powder material of a second type and comprises a respective second containment chamber having a respective second output mouth, whose longitudinal extension is transverse (in particular, perpendicular) to the feeding direction; the first output mouth has respective first passage areas arranged in succession along the longitudinal extension of the first output mouth; the second output mouth has respective second passage areas arranged in succession along the longitudinal extension of the second output mouth; the feeding assembly further comprises an operating device, which is designed to enable the output of the powder material (CA; CB) selectively through one or more of the first and the second passage areas (16, 17); the compacting machine further comprises a detection device for detecting how far the conveyor device transports the powder material along the given path, and a control unit, which is designed to store a reference distribution of the powder material (CA, CB) of the first and of the second type to be obtained in the powder material transported by the conveyor assembly and to control the operating device depending on the data detected by the detection device and on the reference distribution. the compacting machine comprises a compacting device, which is arranged in the area of a work station and is designed to compact the powder material so as to obtain a layer of compacted powder; a conveyor assembly to transport the powder material along a first portion of a given path in a feeding direction from an input station to the work station and the layer of compacted powder along a second portion of the given path from the work station to an output station; and a feeding assembly, which is designed to feed the powder material to the conveyor assembly in the area of the input station; wherein the feeding assembly comprises a first and at least one second feeding device (10, 11) arranged above the conveyor assembly; the first feeding device is designed to contain a powder material of a first type and comprises a respective first containment chamber having a respective first output mouth, whose longitudinal extension is transverse (in particular, perpendicular) to the feeding direction; the second feeding device is designed to contain a powder material of a second type and comprises a respective second containment chamber having a respective second output mouth, whose longitudinal extension is transverse (in particular, perpendicular) to the feeding direction; the first output mouth has respective first passage areas arranged in succession along the longitudinal extension of the first output mouth; the second output mouth has respective second passage areas arranged in succession along the longitudinal extension of the second output mouth; the feeding assembly further comprises an operating device, which is designed to enable the output of the powder material (CA; CB) selectively through one or more of the first and the second passage areas (16, 17); the compacting machine further comprises a detection device for detecting how far the conveyor device transports the powder material along the given path, and a control unit, which is designed to store a reference distribution of the powder material (CA, CB) of the first and of the second type to be obtained in the powder material transported by the conveyor assembly and to control the operating device depending on the data detected by the detection device and on the reference distribution.