With the popularity of smartphones, the headset has one for each person. But for some people who are pursuing sound or music, how can the matching headphones meet their needs?
However, it can fully reflect the shock of the music and is easy to carry. Only the soundproof HIFI in-ear headphones can be obtained. So how do you choose a HIFI in-ear earphone that suits you, so that your headphones can enjoy the music? Let's go to science.
HIFI in-ear headphones classification
Nowadays, the HIFI earphones in the market are mainly divided into two categories: dynamic and electrostatic. Although there are several kinds of magnetic types in addition to these two types, the market share is very small, we will not said.
Dynamic ring headset principle: At present, most (about 99%) earphone earphones belong to this class. The principle is similar to ordinary speakers. The coil in the permanent magnetic field is connected with the diaphragm, and the coil drives the diaphragm to sound under the signal current drive. .
Inside the ear, Dachangjun recommends the RHA T20i for you.
The T20i is the RHA Hi-Fi flagship headset, the DualCoilTM double-coil drive unit, which is a one-piece stainless steel construction that is built to last. There is also a replaceable tunable filter that can be adapted to high frequency vocals, average integrated or low frequency bass according to personal preference. The ergonomic plastic ear can be worn on the ear for a long time. A three-button, line-controlled microphone that controls calls, music, and volume.
Electrostatic earphones: The diaphragm is in a changing electric field. The diaphragm is extremely thin and accurate to a few micrometers (currently STAX's new generation of electrostatic earphone diaphragm has been accurate to 1.35 microns), and the coil drives the diaphragm to sound under the electric force.
Static headphone schematic:
Static headphones, the most popular on the market today is the SHURE KSE1500 electrostatic sound insulation headset system.
Headphone related parameter impedance (Impedance)
Note the difference between the meaning of resistance and the meaning of resistance. In the world of direct current (DC), the effect of an object on current obstruction is called resistance, but in the field of alternating current (AC), in addition to resistance blocking current, capacitance and inductance also hinder current. Flow, this effect is called reactance, and our daily impedance is the sum of the resistance and the reactance in the vector.
The higher the parameter, the greater the thrust required for the headset. For example, Iphone, Samsung, and Huawei mobile phones can push headphones with an impedance of 32 ohms or less. The high impedance can only be connected to the amplifier. Or connect an MP3 with a power amplifier function to play. However, in general, the common headphones in circulation on the market are below 32 ohms (Ω), and only the professional or professional monitor-level headphones will go to the impedance of 40-60 ohms (Ω).
Sensitivity
Point to the sound pressure level that the earphone can emit when inputting 1 mW of power to the earphone (the unit of sound pressure is decibel, the louder the sound pressure is, the higher the volume), so the higher the sensitivity and the smaller the impedance, the easier the earphones will sound. The easier it is to drive.
The same sensitivity is also a high-fidelity standard for judging HIFI headphones. The higher the sensitivity, the better it is for mobile phones and MP3 players. However, if it is a high-impedance earphone, it is best to use a power amplifier to improve the sound of the sound source.
Frequency Response (Frequency Response)
The sensitivity value corresponding to the frequency is the frequency response, and the image is the frequency response curve.
Human hearing can reach a range of about 20Hz-20000Hz, which is now achieved in mature headset technology.
Knowledge about amplifiers
Generally speaking, the current earphone design is in line with the needs of the user, and can be directly pushed by the general mobile phone.
But for some high-purchasing, or high-impedance headphones, you must have an amplifier to support and amplify the sound to meet the needs of users. A general amplifier can be divided into two types: a transistor (stone machine) and a tube (amplifier) ​​amplifier.
Power amplifier (only for general users):
There are already portable amplifiers for mobile phones/earphones on the market today. This kind of attack and release generally has integrated enhanced signal power to drive high-impedance headphones, volume control, multiple EQ selection and other functions. The only common feature is that it does not have its own sound source and needs to be connected to a mobile phone or an MP3 player.
For example, the SHURE SHA900 is designed for in-ear headphones and headsets to enhance sound and let you use it wherever you want. You can control the music with advanced customizable equalization to adjust the tone balance for the desired sound.
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