Hi-Fi is the abbreviation of English High-Fidelity, which literally translates as "high fidelity", and its definition is: playback sound that is highly similar to the original sound. So what kind of audio equipment plays Hi-Fi? So far, it is difficult to draw a clear conclusion. Professionals in the audio industry use various instruments and means to detect various indicators to determine the Hi-Fi degree of equipment, while audio lovers often judge whether the equipment reaches their own Hi-Fi through their own ears. To judge the high fidelity of reproduced sound, we should not only have excellent equipment and software, but also have a good listening environment. Therefore, there are differences between objective testing and subjective evaluation on how to correctly measure the high fidelity of audio equipment.

Hi-Fi= hi-fi, hi-fi system in the mouth of enthusiasts generally refers to audio equipment with high technical indicators. Hi-fi is endless.

So, how is the HIFI sound system made up?

Hi-fi system can be divided into integrated, packaged and combined. Integrated sound system is to assemble all kinds of functional equipment and speakers in a box, which cannot be disassembled at will. This kind of machine is generally low-grade and popular. The package audio system is designed by the manufacturer, with various equipment, and each unit can be disassembled. Audio combination is to choose various types of equipment according to personal preferences and freely combine them.

The sound system is mainly composed of auditory system (human ear), hardware system (equipment), software system (signal source) and listening environment.

Refers to the equipment that converts magnetic signals or digital signals in audio source software into electrical signals, mainly including DVD, S-VCD, VCD, CD, tuner, card holder, hi-fi video recorder, etc.

The power amplifier mainly amplifies the weak signal input by the sound source equipment and generates enough current to push the speaker to play back the sound.

The loudspeaker is the sound tube of a set of audio equipment. The final sound of audio source software depends on the speaker, and the quality of audio equipment restoration depends entirely on the speaker, so the speaker plays a decisive role in audio equipment.

What are the main technical indicators of the sound system?

There are also the main technical indicators of the sound system: frequency characteristics, signal-to-noise ratio, dynamic range, transient response, stereo separation and stereo balance.

Frequency characteristics: the frequency range (frequency response) of audio equipment during playback and the relationship between signal amplitude and frequency (amplitude-frequency characteristics). The unit of amplitude is dB, and the unit of frequency is Hz. The frequency response of the sound system should be at least 32- 18000Hz, and the signal amplitude change should be less than 2dB within this frequency range.

Signal-to-noise ratio: the logarithm of the ratio of useful signal to noise at the same reference point. At the input point of the speaker, the signal-to-noise ratio is 70dB, and the noise is almost inaudible when the human ear is one meter away from the speaker, and the Hi-Fi system generally reaches more than 100dB.

Dynamic range: the logarithm of the ratio of the maximum undistorted output power of audio equipment to the static system noise output power. Hi-Fi system generally reaches 100dB or above.

Distortion: the degree of distortion of the sound source signal when the audio equipment plays back. There are harmonic distortion, intermodulation distortion and transient distortion. The harmonic distortion of Hi-Fi system is generally less than 1%.

Stereo resolution: the resolution of the left and right channels. Reflect the crosstalk degree of the left and right channels.

Stereo balance: the difference between the signal gains of the left and right channels.

What are the terms commonly used by audiophiles?

There are many "jargon" commonly used among audio enthusiasts. Here are a few terms:

Nerve line: signal line with low level and low current.

Heating wire: speaker wire with larger cross section and more strands.

Boiler: a method (process) to complete the running-in period of equipment in a short time.

Copier: modification, the transformation process of audio equipment.

Courage machine: electron tube power amplifier.

Stone machine: transistor power amplifier.

Cholelithiasis machine: hybrid power amplifier of electron tube and transistor.

Ring bull: ring transformer. The magnetic leakage of the ring cow is small.

Dashuitang: Capacitance filtering power supply system above 10000uF.

Tonics: high-grade components.