Quality and clear sound without interference in reproduction is a measure of the correctness of sound systems.
Depending on the complexity and type of audio system such as 100v lines or low ohm lines, failures can be very different.
The most common faults are: The amplifier includes some of the protections.
There is no sound on the speakers.
One channel or one sound system does not work. Only certain speakers do not work or work poorly.
Poor sound quality on the main sound system accompanied by distortion, noise, hum or buzzing.
The microphone is hard or hard to hear, buzzes or has distortion when speaking.
If any of these problems occur, your audio system is partially flat or faulty and needs to be serviced.