Four: Literacy Skills
Typically, wireless microphones used for singing are directional, so standing to the sides or behind the speakers with the microphone can help prevent feedback howling. If standing in front of the speakers is necessary, it's crucial to maintain a specific angle between the microphone and the speaker to avoid echoes.
Compared to holding a wireless microphone vertically or horizontally at an angle of 90 degrees or more from the speaker, it can reduce feedback noise. For cardioid directional microphones, keeping the front facing away from the speaker at 180 degrees or for super-cardioid microphones, keeping the front facing the speaker at 120 to 140 degrees minimizes feedback. If you're unaware of your microphone's directional characteristics and are facing the speaker, it's easy to cause loud feedback. Since the angle between the microphone and the speaker is a taboo, at such an angle, any expensive microphone can easily produce a shrill echo.
V. Interference with Literacy
When selecting a wireless microphone, it's important to be aware of the local TV station's transmission frequencies and avoid choosing those that overlap. If it's a new location, if possible, add high-density wire or metal sheets to the roof and surrounding area during the construction phase to shield and isolate interference from external wireless signals. Additionally, you can use the SQUEECH button on the receiver to suppress interference signals (though this may affect the microphone's reception range).
Section VI: Antenna and Signal Literacy
When using multiple wireless microphone systems from the same series, if possible, utilize an antenna distribution unit to minimize mutual interference between antennas on the original receiver. Additionally, maintain an appropriate horizontal spacing between microphone receivers to ensure better reception conditions among the receivers and avoid interference between frequencies, thereby achieving a superior wireless signal.
Seven: Digital Literacy
When using two or more identical handheld wireless microphones simultaneously, it is recommended to mark the bottom of each microphone (where the microphone is less likely to be obstructed by the hand) with different colors. Corresponding color markings should also be placed on the microphone channels on the soundboard. This way, if an error occurs with the wireless microphones, operators can correct it promptly. Additionally, using colored microphone dust covers for marking can enhance sound quality while also serving as a microphone identifier, achieving two benefits with one action. To prevent confusion with lavalier wireless microphones, each microphone can be numbered or assigned a color, and designated individuals should be responsible for assigning and swapping them before the performance.
Eight: Literacy in the Absence of Verbal Expression
Performers often alternate the use of handheld wireless microphones during performances. Some may inadvertently turn off the power to the wireless transmitter or switch on the microphone's mute button, leaving the microphone in a muted state. This can lead to an embarrassing situation where the next actor using the wireless microphone has no sound. Generally, when the wireless microphone transmitter's power is off, the transmitter activity indicator light on the receiver will turn off. Operators can then easily check the wireless receiver indicator lights to identify any issues promptly. However, if the "mute" switch is activated, operators will only hear the change in program through their headphones. To prevent the microphone from going silent, it is advisable to use tape to secure the mute switch.
Battery Selection: Literacy
To ensure the proper functioning of the wireless microphone system, sufficient energy batteries must be used, and 9-volt alkaline batteries are recommended. It is also crucial to confirm the battery's charge before purchasing and using them.
Most V-band wireless microphone receivers do not have a battery level indicator for the transmitter. To prevent audio signal distortion due to low battery, operators can use the console's PFL (Pre-Fade Listen) function to monitor the wireless microphone signal through headphones while the microphone is in normal use. If there is a slight increase in noise on the microphone channel, batteries should be replaced immediately.
At the concert, switch the "Mute" function on the soundboard's channel to silence the wireless microphone. If the soundboard lacks this feature, simply turn off the output level of the wireless microphone, then turn off the transmitter power, replace the battery, and turn on the transmitter power again to adjust the receiver output level. Alternatively, use the Line/MIC selector to disable the input signal, and reset the soundboard's input gain or selector key after replacing the battery.