Ferrofluid was developed as a by-product of the space development program in the United States. After that, its application to commercial equipment was considered, and it was applied to the speaker after the seal mechanism. Is only able to function when placed in a magnetic field, and speakers were one of the largest markets for permanent magnets.

A speaker manufacturer in the United States, who was suffering from low production yield due to coil disconnection due to incomplete centering (maintenance of the voice coil) of the voice coil in the production process, said, ), the centering effect appeared and the production yield improved significantly.” The use of magnetic fluid has been found to have favorable effects for speakers, such as heat dissipation and damping effects, and the technology for applying magnetic fluid to speakers has become popular. "