Grabbing two wireless microphones at once is a serious mistake:
Interference from harmonic distortions arises when two transmitters with different frequencies are used close together, with the severity increasing as proximity or frequency increases. In systems utilizing multiple channels simultaneously, the issues of mutual interference and unstable reception are exacerbated.
Multiple wireless microphones placed together not only cause high-frequency harmonic interference but also result in significant issues such as phase and directional interference, which degrade the original sound quality characteristics of the microphones. When the audio phase of the microphones is the same, their outputs combine, leading to an increased volume and feedback. Conversely, if the phases are opposite, the amplifier's output worsens, causing insufficient volume. The directional characteristics of the microphones can also interfere with each other when placed close together, diminishing their superior directional properties. This degradation is proportional to the distance between the microphones. Users should avoid holding two or more wireless microphones simultaneously to prevent a decrease in volume, frequency response, and directionality. While some may think that carrying multiple microphones can prevent a single unit from failing, this is not the case. To prevent abnormal phenomena with wireless microphones, the "having one foot in two boats" approach does not suffice. Instead, it is recommended to replace "simultaneous use" with "alternation" to avoid the mentioned shortcomings. If multiple microphones must be used simultaneously, they should be spaced at least 30 centimeters apart to minimize changes to the microphone characteristics.
Section 3: Distance Education
When using an induction wireless microphone to sing, attention should be paid to the microphone holding posture, as the distance between the microphone and the mouth affects sensitivity and sound quality significantly. Particularly, since the sensitivity of the microphone is inversely proportional to the square of the distance from the mouth, performers with insufficient vocal force cannot hold the microphone with an overly high degree of saturation, preventing them from holding the microphone too close to their mouth, thus avoiding holding it too close.
Additionally, due to the pronounced proximity effect characteristic of directional microphones with large diameters, when the microphone is close to the mouth, it significantly boosts the bass. Therefore, if your voice lacks sufficient low-end tone, you can position the microphone closer to your mouth to leverage the proximity effect and compensate for your low-end sound, resulting in a richer and brighter voice.
The distance between the microphone and the mouth greatly affects the popping noise, especially with highly sensitive and responsive microphones, where the noise can be more pronounced. To minimize the loss of this noise, in addition to adjusting the distance of the microphone, it's crucial to choose a microphone with good popping noise suppression characteristics. The better the microphone, the more it can prevent popping noise.
Four: Literacy Skills
Typically, wireless microphones used for singing are directional, so holding the microphone and standing to the sides or behind the speakers minimizes feedback howling. If standing in front of the speakers is necessary, it's crucial to control the angle between the microphone and the speakers to avoid echoes.
Holding a wireless microphone with a vertical or horizontal position at least 90 degrees away from the speaker angle can minimize feedback. For cardioid directional microphones, maintaining a 180-degree angle with the speaker reduces feedback, while super-cardioid microphones should be kept between 120-140 degrees for minimal feedback. If you're unsure about your microphone's directivity and are facing a speaker, it can easily cause loud feedback. Since the angle between the microphone and the speaker is a taboo, at such an angle, even the most expensive microphone can easily produce a piercing echo.