Usually, headphones with bad female voices will have some coloring in the mid-frequency. If there is a certain modification to the mid-frequency, that is, the human voice, it will make the female voice sound sweet and close.

The fundamental tone of most natural musical instruments falls in the mid-frequency band. The most concentrated energy of the human voice is between 500 and 1000 Hz. The overtones of many natural musical instruments also mainly fall in the mid-frequency band. For example, the overtones of guitars mainly fall in the 2000-5000 Hz range. The same goes for viola and cello.

Usually for headphones with female vocals, the mid-frequency will not be too thick, but will tend to be clear and clear. Some old female voices will be modified to be several years younger, full of vitality and strong appeal. Therefore, people who listen to it will feel a kind of ***** or feel moved, which is what is called the female voice being poisoned.

Generally, Japanese styles will make such modifications in the mid-frequency. The female voice sounds sweet and charming, but relatively speaking, the male voice is not so nice. The style of this type of headphones is clean and elegant, which is not suitable for listening to heavy music such as rock.

Extended information

When divided by frequency, medium frequency (MF, Medium Frequency) refers to the frequency band from 300KHz to 3000KHz, most of which are AM radio stations. When divided according to its position and role in the circuit: IF intermediate frequency (Intermediate Frequency) refers to a signal obtained by frequency conversion of a high-frequency signal.

Intermediate frequency has two meanings:

First, it is divided according to the level of frequency. Medium Frequency (MF) refers to the frequency band from 300KHz to 3000KHz, most of which are AM radio stations. The propagation distance is short during the day, and the ionosphere can be used to reflect signals at night, so it can be propagated over long distances. However, it is more susceptible to interference from other radio waves.

Second, when divided according to its position and function in the circuit: IF intermediate frequency (Intermediate Frequency) [2] refers to a signal obtained by frequency conversion of a high-frequency signal. In order to make the amplifier work stably and reduce interference, general receivers must convert high-frequency signals into intermediate-frequency signals.

Reference material: Baidu Encyclopedia IF