The impedance characteristics of giant magnetostrictive flat panel loudspeaker are studied by using experimental investigations and equivalent circuit analysis.The constant current method is used to test its impedance characteristics.The experimental results show the impedance of giant magnetostrictive flat panel loudspeaker has the similar frequency varying trend to high-loss inductance, and does not contain low-frequency resonant peaks of moving-coil loudspeaker.In addition, this paper discusses the problem of amplitude and frequency equilibrium of power amplifier connected to the impedance of giant magnetostrictive flat panel loudspeaker.%对超磁致伸缩平面扬声器的阻抗特性进行了实验研究和等效电路分析,通过恒流法测试其阻抗特性.结果表明:超磁致伸缩平面扬声器的阻抗随着频率的变化趋势类似于高损耗电感,不存在动圈式扬声器阻抗特性的低频谐振峰.还讨论了与之相配接的功率放大器的幅频均衡问题.
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