| 摘要 |
PURPOSE:To drive an acoustic equipment with a usual power amplifier by driving a speaker with a difference between the entire drive signal and component signals other than that at a specific frequency band, that is, with a component signal at the specific frequency band in the drive signal. CONSTITUTION:The entire drive signal drives one input terminal (with respect to a ground terminal) of a speaker 2 and a component signal at frequency bands other than a specific frequency band in the drive signal drives the other input terminal (with respect to a ground terminal) of the speaker 2. That is, a usual power amplifier 1 is used as a drive signal source and the speaker 2 is differentially driven through a path from the usual power amplifier 1 and a path (auxiliary path) of an auxiliary amplifier 31 branched from the path of the amplifier 1 and the auxiliary path is used to set the drive characteristic. Thus, the band of the drive signal source such as that of the power amplifier is not limited especially except that the band includes all or a part of the specific frequency band and the user uses freely a preferred power amplifier to drive the speaker. |
