In audio equipment, the size of the electrical-acoustic or acoustic-electrical conversion ability of the device is called the sensitivity of the device. With regard to active speakers, sensitivity refers to the sensitivity of the amplification factor of the internal amplifier and the combination of loudspeakers, and the sound of small power sources such as Walkman with a large amplification factor and a small audio output power is very loud. With regard to passive speakers, sensitivity refers to the sound intensity of the speaker combination at 1M when the power amplifier system gives the speaker a 1000Hz signal of 1W. Sometimes some sound systems are forced to reduce sensitivity for the sake of sound quality and work stability.
The sensitivity of speakers may be one of the common indicators that can easily be misinterpreted. For a long time, the amplitude-frequency response of the speaker is often simplified to a single value, that is, sensitivity. This is the root cause of misunderstanding. Some people think that this value indicates the loudness of a speaker when replaying a signal; others think that two speakers with the same sensitivity have the same loudness when replaying the same signal. Both views have limitations. In fact, the sensitivity of the speaker can only reflect the sound pressure level of the speaker when it is aimed at specific bandwidth and spectrum content signals. Bluetooth speakers recommend that if the frequency response of two speakers with the same sensitivity is different, the output sound pressure level may be different when the same signal is replayed.