At present, there are many kinds of stage audio equipment on the market with different functions, which brings some difficulties to the selection of audio equipment. So what is the selection of stage audio including a complete set of equipment?
The microphone is the first "entrance" of the sound reinforcement system. The output voltage of the natural sound source signal after acoustic electric conversion by the microphone is processed and amplified by the mixer and power amplifier, and then fed into the speaker system for amplification. Multiples can reach tens of thousands.
The performance of microphone directly affects the quality of the system; The characteristics of the microphone directly affect the pickup and playback effect of the system; The placement of microphone directly affects the transmission gain of the system; The signal feed of microphone directly affects the signal-to-noise ratio of the system. The correct use of microphone is one of the keys to the good working condition of the whole sound system.
The selection of microphone must adapt to its acoustic environment and pickup object. It needs to be weighed according to the overall requirements of the sound reinforcement system, application occasions, pickup sources, the technical characteristics of the microphone itself and the characteristics of the hall.
Loudspeaker is the mouthpiece of the whole sound system, so it should be regarded as the primary factor. The selection of loudspeakers shall start from the sensitivity and rated power of loudspeakers to determine the power of each sound source. The directivity of the loudspeaker is used to analyze and control the sound field in the hall, determine the position, input impedance and input power of each loudspeaker, and calculate the matching power between the loudspeaker and the power amplifier.
In order to ensure the overall sound quality of the sound reinforcement system, the power amplifier must have sufficient power margin to work stably for a long time. At the same time, the selected amplifier should have perfect technical measures to improve efficiency, reduce distortion, short circuit and no-load protection, and reduce temperature rise.
Mixer and other equipment
The mixer is the core of the whole sound system. It should have good electrical performance, stable working state, flat frequency response and small harmonic distortion. The functions of mixers vary greatly, and different quantities need to be selected according to the functional requirements of the whole system. Mixer for input channels and output groups.
In addition, you can choose the appropriate equalizer according to the acoustic requirements of different halls. Delay, reverberation, compression limiter, frequency shifter and other equipment form a normal, stable and reliable sound reinforcement system.
Program source equipment
The program source part includes the reception and retransmission of FM and am broadcasts, and the playback of devices and devices such as records (including CD records) and tapes. Due to the low input level of the program source, all components and equipment must ensure high sensitivity, high signal-to-noise ratio, low distortion and good reliability.
In fact, in general, professional stage audio equipment consists of microphone + Mixer + power amplifier + speaker. If you want professional stage sound effect, in addition to professional stage construction staff, you also need to add sound equipment such as effector, sequencer, equalizer and voltage limiter. For more information, please visit www.wenguangzhining.com Check it out. Www. 68mn.