A docking station for docking of a plurality of portable media devices (100A, 100B), the docking station comprising: a main body; a plurality of accommodation units (212A, 212B) to accommodate the plurality of portable media devices (100A, 100B); and a plurality of docking ports (213A, 213B) to provide electrical connection between the plurality of portable media devices (100A, 100B) and the docking station, the plurality of docking ports (213A, 213B) being installed in the plurality of accommodation units (212A, 212B), a sound signal processor to perform a signal processing process on a sound signal transmitted from the plurality of portable media devices (100A, 100B) accommodated in the plurality of accommodation units in order to reproduce the sound signal; wherein each of the plurality of docking ports (213A, 213B) supports electrical connection between the docking station and any one of the plurality of portable media devices (100A, 100B) belonging to the different product groups, wherein a product group comprises a standard connector or data communication protocol for a group of products; and wherein a first portable media device of the plurality of portable media devices is not compatible with a second docking port of the plurality of docking ports; characterised by a plurality of sound signal preprocessors (235A, 235B) each arranged to receive a sound signal from a respective one of the plurality of portable media devices (100A, 100B), to perform signal processing on the sound signal according to the specific processing requirements of the product group to which the portable media device belongs, and to pass the preprocessed sound signal to the sound signal processor. a main body; a plurality of accommodation units (212A, 212B) to accommodate the plurality of portable media devices (100A, 100B); and a plurality of docking ports (213A, 213B) to provide electrical connection between the plurality of portable media devices (100A, 100B) and the docking station, the plurality of docking ports (213A, 213B) being installed in the plurality of accommodation units (212A, 212B), a sound signal processor to perform a signal processing process on a sound signal transmitted from the plurality of portable media devices (100A, 100B) accommodated in the plurality of accommodation units in order to reproduce the sound signal; wherein each of the plurality of docking ports (213A, 213B) supports electrical connection between the docking station and any one of the plurality of portable media devices (100A, 100B) belonging to the different product groups, wherein a product group comprises a standard connector or data communication protocol for a group of products; and wherein a first portable media device of the plurality of portable media devices is not compatible with a second docking port of the plurality of docking ports; characterised by a plurality of sound signal preprocessors (235A, 235B) each arranged to receive a sound signal from a respective one of the plurality of portable media devices (100A, 100B), to perform signal processing on the sound signal according to the specific processing requirements of the product group to which the portable media device belongs, and to pass the preprocessed sound signal to the sound signal processor.