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What is frequency response (f special)?

  The frequency response is [shitamono] under the numerical value as for the response of each bandwidth to the signal to which [frequency response] has been sent from the amplifier in which f special [toha] and the input are assumed to be constant for short. The most important index for reading performance of speaker from catalog.

Least difficulty [shii] explanation

  The measuring method of the frequency response is added a constant voltage to the speaker, measures the frequency change in the sound pressure level caused in the point of 1m on a standard axis with the mike, and graphs. As for the source used for the measurement, the pink noise and the sweep signal that similarly contains each frequency are used.

  Recently, everyone comes to be able to measure it easily by the spread of the personal computer though a large scale machine was necessary for the measurement of the frequency response in old times. The photograph below is one example of the frequency response that uses the personal computer.




  The effect bandwidth is given by the lower bound of a low region and the upper bound of a high region, and they decrease more than the output sound pressure level of the average of an inside compass 10db and are defined by the frequency. Because even 16khz ..low region.. has been reproduced when doing that the average of an inside region is 60db when saying in figure above ..even about 80hz's high region.., the effect bandwidth of this speaker can be called 90hz-16khz.

  Judging from the viewpoint "Original sound reproduction", it is assumed that it is preferable that the frequency response of the speaker is generally wide and smooth. However, such a speaker doesn't necessarily limit that it is so whether make a hit with everyone and put.