If the sensitivity level or sound pressure level measured on the reference axis of the loudspeaker increases with frequency. Listeners have a bright, thin or hard feel to the reproduction of the sound. Conversely, if the sound level decreases as the frequency increases, the sound reproduction will feel dull or heavy, giving the impression that the loudspeaker radiates too little treble.
In the frequency range of about 2000-6000 Hz, human hearing is particularly sensitive. As long as the sound pressure level is increased by a few decibels in this frequency range, the playback will have a sense of presence, that is to say, the listener will get a It was as if the speakers were right in front of him. On the contrary, if the sound pressure level is attenuated accordingly, the listener will feel that the horn speaker seems to be farther away from him. Sudden changes in sound pressure level can cause a particularly unpleasant feeling of hearing, such as the unpleasant sound that occurs when the crossover frequency between the individual Horn speakers in the speaker combination is not selected properly, or when several speakers with different efficiencies are used. resemblance. If in the mid frequency range of about 400-4000 Hz. The sound pressure decreases with the increase of frequency, and it suddenly rises at higher frequencies, so the treble will give people a very unnatural feeling.
