| 摘要 |
PURPOSE:To cope with the specification change of a main speaker without modifying circuit constitution by measuring in advance an equivalent mechanical impedance of an auxiliary speaker and applying a signal proportional to the product between the velocity signal of the main speaker detected by the sensor and the mechanical impedance to the auxiliary speaker. CONSTITUTION:A sensor 13 detecting the diaphragm velocity of the main speaker 1, and an auxiliary speaker drive amplifier 12 receiving a detection signal of the sensor 13 and applying a signal proportional to the product between the diaphragm velocity of the main speaker 1 and the equivalent mechanical impedance of the auxiliary speaker 2 mounted in the cabinet 3 to the auxiliary speaker 2 are provided. That is, the signal proportional to the product between the diaphragm velocity of the main speaker 1 and the mechanical impedance of the auxiliary speaker 2 mounted in the cabinet 3 is fed to the auxiliary speaker 2 and the change in the back pressure caused by the operation of the main speaker 1 is eliminated by the vibration of the speaker 2. Thus, the design is not independent of the specification change in the main speaker 1 and the composite direct radiation speaker system with stable operation is obtained. |
