The use of a wireless microphone near the speaker or facing the speaker is the most taboo way, no matter how expensive the microphone, in such circumstances the use of the most likely to produce feedback whistle.

Generally speaking, most of the wireless microphone with a directional sound head, if you use the correct angle, you can reduce or avoid the feedback sound generated with the speaker. (See Figure 9), if you want to stand in front of the speaker to use the vertical or horizontal direction and the angle of the speaker to maintain more than 90 degrees or more (see Figure 9), if you want to use the speaker, , Can reduce the feedback sound (Figure 10). Heart-shaped directivity of the microphone front and speaker to maintain 180 degrees (Figure 11) or ultra-directivity of the microphone front and speakers to maintain 120 ~ 140 degrees between the minimum feedback sound (Figure 12)