Sound range: the range between the highest and lowest sounds achieved by an instrument or human voice

 Tone: also known as sound, one of the basic attributes of sound, such as erhu, pipa is different timbre

 Sound dye: the natural neutral opposite of music, that is, the sound is infected with some characteristics that the program itself does not have, such as the sound of speaking to a jar is a typical sound dye.

 Distortion: the output of the device cannot fully reproduce its input, resulting in the distortion of the waveforms or the increase or decrease of the signal components.

Dynamic: The ratio of maximum to minimum information is allowed to be recorded.

 Transient response: the ability of the equipment to follow the burst signals in the music. Transient response of good equipment should be a signal came immediately response, the signal stopped on the sudden stop, never muddy.(Typical musical instrument: piano)

 SNR ratio: also known as signal noise ratio, the useful component of the signal and noise intensity contrast, often expressed by decibel number. A higher SNR of the device indicates that it produces less noise.

 Air sensation: an acoustic term used to indicate the openness of the high pitch, or the spatial interval between the instruments. At this point, the high-frequency response can be extended to 15 kHz-20 kHz. There are "gray (scroll)" and "thick (tick)".

 Low-frequency extension: refers to the lowest frequency that the audio equipment can be rearranged. It is used to determine how far the sound system or speaker can dive when the bass is replay.

Bright: refers to the high frequency band highlighting 4 kHz-8 kHz, when the harmonic is relatively stronger than the base wave.