The quality of recording pen is poor, the AD conversion circuit is poor, and the signal-to-noise ratio is low;

Poor quality of mixer, cable or microphone, resulting in noise;

The sound receiving position of the on-site microphone is not good or the on-site environmental noise is high, resulting in excessive environmental noise;

Distortion caused by signal level mismatch when the equipment is connected (for example, the recording level is set too high, which is beyond the scope of the chart);

Therefore, in order to record good sound quality, we must consider the above points.

In addition, no matter the wedding scene or the performance scene, or the karaoke songs at home, even if only the Mic channel is recorded, the ambient sound will be received to varying degrees.