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 (A), and the protruding portion extends from the central cylinder along the axial direction (A) 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 (A), and the protruding portion extends from the central cylinder along the axial direction (A) 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 . <EOS>