COAXIAL TYPE FLAT SPEAKER

PURPOSE:To make the frequency characteristic flat by forming an edge of an up-roll adhered to a diaphragm of each range that a volume raised over the face of the diaphragm is equal or nearly equal to a volume of a part lowered from the face of the diaphragm. CONSTITUTION:The edges 6a, 6b are formed as the up-roll and the volume A for the part raised over the face of the diaphragm of the edges 6a, 6b and volume B at a part lowered from the face of the diaphragm are made equal or nearly equal so as to minimize the interference effect of sound due to a groove on a concentric circle of a tweeter and the resonance of the edges 6a, 6b is minimized. Thus, the frequency characteristic of the tweeter is made flat as shown in Fig.