Speaker

1. A speaker comprising:

a frame;

a magnetic circuit disposed in the frame and having a magnetic gap;

a voice coil disposed movably with respect to the magnetic gap in the magnetic circuit;

a diaphragm having an inner circumferential edge coupled to the voice coil, and an outer circumferential edge coupled to the frame via a first edge; and

a suspension holder coupled to a backside of the diaphragm and having an outer circumferential edge coupled to the frame via a second edge;

wherein the frame has a block construction including a first frame part and a second frame part, and an outer circumferential edge of the second edge is sandwiched between the first and second frame parts; and

wherein the first edge has a shape symmetrical to a shape of the second edge; and

wherein the first edge has a ring shape surrounding the diaphragm and the second edge has a ring shape surrounding the suspension holder, and a diameter of the ring shape of the first edge and a diameter of the ring shape of the second edge are equal to each other.

2. The speaker of claim 1 , wherein the frame is divided in a position set below an upper end of the magnetic circuit.

3. The speaker of claim 1 , wherein the first and second edges have amplitude characteristics symmetrical to each other.

4. The speaker of claim 2 , wherein the first and second edges have amplitude characteristics symmetrical to each other.

5. The speaker of claim 1 , wherein the first edge and the second edge project in directions opposite to each other.

6. The speaker of claim 5 , wherein the first edge and the second edge project away from each other.

7. The speaker of claim 2 , wherein the first edge and the second edge project in directions opposite to each other.

8. The speaker of claim 7 , wherein the first edge and the second edge project away from each other.

9. The speaker of claim 1 , wherein

the first edge and the second edge project in directions away from each other.

10. The speaker of claim 2 , wherein

the first edge and the second edge project in directions away from each other.

11. The speaker of claim 1 , wherein the suspension holder is coupled to the backside of the diaphragm at a location spaced outwardly away from the voice coil.

12. The speaker of claim 2 , wherein the suspension holder is coupled to the backside of the diaphragm at a location spaced outwardly away from the voice coil.

13. The speaker of claim 5 , wherein the suspension holder is coupled to the backside of the diaphragm at a location spaced outwardly away from the voice coil.

14. The speaker of claim 7 , wherein the suspension holder is coupled to the backside of the diaphragm at a location spaced outwardly away from the voice coil.

15. The speaker of claim 9 , wherein the suspension holder is coupled to the backside of the diaphragm at a location spaced outwardly away from the voice coil.

16. The speaker of claim 1 , wherein

the diameter of the first edge is defined between diametrically opposite points on a first ridge at an apex of the first edge outside of the diaphragm; and

the diameter of the second edge is defined between diametrically opposite points on a second ridge at an apex of the second edge outside of the suspension holder.

17. The speaker of claim 1 , wherein

the first ridge of the first edge and the second ridge of the second edge are, coincident with each other when viewed along an axial direction of the ring shapes of the first and second edges.

18. The speaker of claim 1 , wherein

the first frame part and the second frame part respectively have cylindrical inner peripheral surfaces that are aligned with each other such that the frame has an overall cylindrical inner peripheral surface, thereby allowing the first and second edges to have the ring shapes thereof of equal diameters.