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本文阐明了铁磁流体电动式声源的换能机理．我们详细地研究了它的磁路结构，及在振动活塞上安置一个大的橡皮充气球泡，它能提高低频的辐射效率．这声源具有4个倍频程的低频宽带发射响应
This article illustrates the transduction mechanism of a ferrofluid-powered electric sound source. We studied its magnetic circuit structure in detail and placed a large rubber-filled bulb on the vibrating piston that improves the low-frequency radiation efficiency. This source has 4 octaves of low frequency broadband transmit response