| Test index | Abbreviation | Key function | Unit | 
| Frequency response curve | FR | Reflecting the processing ability of different frequency signals is one of the important parameters of audio products | dBSPL | 
| Distortion curve | THD | The deviation of signals of different frequency bands in the transmission process compared with the original signal or standard | % | 
| Equalizer | EQ | A kind of audio effect device, mainly used to control the output size of different frequency bands of audio | dB | 
| Power VS distortion | Level vs THD | The distortion under different output power conditions is used to indicate the output stability of the mixer under different power conditions | % | 
| Output amplitude | V-Rms | The amplitude of the external output of the mixer at the rated or permitted maximum without distortion | V |