A driver, comprising: a yoke comprising a base, a central cylinder, and a protruding portion, wherein the central cylinder extends from the base along an axial direction, and the protruding portion extends from the central cylinder along the axial direction towards a direction away from the base; a first magnet comprising a first axial hole, wherein the central cylinder passes through the first axial hole, so that the first magnet is sleeved on the yoke and is in contact with the base; a second magnet located on the yoke, wherein the second magnet comprises a second axial hole, and the protruding portion passes through the second axial hole, so that the second magnet is sleeved on the yoke and is in contact with a top surface of the central cylinder, and the first magnet and the second magnet have the same direction of the magnetic field; a first flux plate comprising a first opening, wherein at least a part of the protruding portion passes through the first opening, so that the second magnet is located between the first concentrating flux plate and the central cylinder, and a first magnetic gap is provided between the first concentrating flux plate and the protruding portion; a second flux plate comprising a second opening, wherein the first opening and the second opening are coaxially disposed along a central axis, the second concentrating flux plate is disposed on the first magnet; wherein the first concentrating flux plate and at least a part of the protruding portion are located in the second opening, and a second magnetic gap is provided between the second concentrating flux plate and the first concentrating flux plate; a first voice coil located in the first magnetic gap; and a second voice coil, located in the second magnetic gap. a yoke comprising a base, a central cylinder, and a protruding portion, wherein the central cylinder extends from the base along an axial direction, and the protruding portion extends from the central cylinder along the axial direction towards a direction away from the base; a first magnet comprising a first axial hole, wherein the central cylinder passes through the first axial hole, so that the first magnet is sleeved on the yoke and is in contact with the base; a second magnet located on the yoke, wherein the second magnet comprises a second axial hole, and the protruding portion passes through the second axial hole, so that the second magnet is sleeved on the yoke and is in contact with a top surface of the central cylinder, and the first magnet and the second magnet have the same direction of the magnetic field; a first flux plate comprising a first opening, wherein at least a part of the protruding portion passes through the first opening, so that the second magnet is located between the first concentrating flux plate and the central cylinder, and a first magnetic gap is provided between the first concentrating flux plate and the protruding portion; a second flux plate comprising a second opening, wherein the first opening and the second opening are coaxially disposed along a central axis, the second concentrating flux plate is disposed on the first magnet; wherein the first concentrating flux plate and at least a part of the protruding portion are located in the second opening, and a second magnetic gap is provided between the second concentrating flux plate and the first concentrating flux plate; a first voice coil located in the first magnetic gap; and a second voice coil, located in the second magnetic gap.