Why is there a gap between the aluminum skeleton voice coil of the horn and the aluminum tube of the voice coil?
This is not only an aluminum foil voice coil, but also other voice coils, except the tube. As for leaving a gap, this does not mean leaving a gap, but because this material is cut into a rectangle, so the gap is generally 0 because the interface of this material cannot overlap and the interface cannot be too large when winding. Five to zero. Between 3 mm.