Bluetooth audio refers to the built-in Bluetooth chip, which replaces the traditional wire-connected audio equipment with Bluetooth connection, and achieves the purpose of convenience and speed by connecting with Bluetooth playback equipment such as mobile phones .
Refers to the difference between the signal before being amplified by the amplifier and the signal after being amplified. Its unit is percentage. Generally speaking, the distortion of multimedia audio should not be greater than 1%, and the subwoofer is more special, reaching 5%.
Signal to noise ratio
The signal-to-noise ratio is too low, and the noise is serious, which will seriously affect the sound quality. Generally speaking, the signal-to-noise ratio of multimedia audio should be greater than 80DB, and the subwoofer should be greater than 70DB. The signal-to-noise ratio of high-fidelity audio should reach above 110DB.
Sensitivity is an index to measure the efficiency of the speaker, and it reflects the amount of power that needs to be input under the same loudness. It has nothing to do with the sound quality of the speaker. Current speaker sensitivity is usually around 86dB, and professional is above 96db.