老師的嗓子在教學(xué)中容易受到傷害，會有不適現(xiàn)象，為了更好的傳遞教學(xué)內(nèi)容不影響我們學(xué)生正常聽課，就會使用教學(xué)擴音器來提高教學(xué)質(zhì)量，同時也能有效的保護好嗓子，一方面便于管理，另一方面幫學(xué)生練聽力。  

擴音器的正確使用方法

1.擴音機使用時應(yīng)避免話筒正對喇叭，音量調(diào)節(jié)合適清晰，這樣能避免失真及反饋嘯叫現(xiàn)象。  

2.使用中不要扯拉、拖絞話筒線，否則容易出現(xiàn)線間導(dǎo)線接觸不良。

3.主機電瓶不要長時間過充過放電，低電量提示時應(yīng)及時充電  

4.寒暑假閑置不用時應(yīng)注意一至兩月充一次電。

5.長期不用應(yīng)讓電瓶放電完。  

6.如果長期不用，應(yīng)放在通風，干燥，遠離熱源，磁場的地方。

選購擴音器時應(yīng)注意  

第一，打開擴音器的開關(guān)，盡量將聲音調(diào)到最大，聽聽是否有雜音。如果沒有雜音，說明擴音器工作在靜止狀態(tài)下是沒有什么雜音的。一些質(zhì)量比較差的擴音器，這個時候很容易有雜音，這樣的擴音器就不值得買了，用不了多久的。

第二，在將擴音器的聲音調(diào)到最大的時候，使用擴音器進行擴音。仔細聽聽擴大之后的聲音是否失真，如果擴音器在最大聲的時候，音質(zhì)清晰，聲音也夠洪亮。這樣的擴音器多半不是什么差的擴音器。  

第三，擴音器的做工，雖然外觀不是最重要的因素，但是擴音器的做工處理確是一個值得我們細究的因素，如果擴音器的做工很粗糙，這些擴音器多數(shù)是不成熟的產(chǎn)品，出現(xiàn)質(zhì)量問題的概率也是比較高的。

新式教學(xué)擴音器  

傳統(tǒng)的教學(xué)擴音系統(tǒng)以有線式為主，新式教學(xué)擴音系統(tǒng)則以無線式為主，尤其是在高等院校中，大多都使用無線教學(xué)擴音器。無線教學(xué)擴音系統(tǒng)最初存在易嘯叫、音質(zhì)失真的、且傳輸距離短的缺點，但后來紅外無線音頻傳輸技術(shù)的發(fā)展，在很大程度上改進了這種新式教學(xué)擴音器。

Vulnerable in the teacher's voice in teaching, there will be unwell phenomenon, in order to pass the teaching content does not affect our normal students listening to lectures, speakers will use teaching to improve teaching quality, but also can effectively protect the good voice, on the one hand, facilitate management, on the other hand to help students to practice listening.
The correct use of the amplifier.
1. When the amplifier is used, the speaker should be avoided and the speaker should be properly adjusted, so as to avoid distortion and feedback.
2. Do not pull or drag the microphone line in use, otherwise it will be easy to have poor contact between lines.
3. The host battery should not be overcharged for a long time, and it should be charged when the battery is low.
You should pay attention to electricity once or twice during the winter and summer vacation.
You don't need to discharge the battery in the long run.
6. If it is not used for a long time, it should be put in the place of ventilation, dry, away from heat source and magnetic field.
Pay attention when purchasing loudspeakers.
First, switch on the amplifier and try to maximize the sound to hear if there is any noise. If there is no noise, there is no noise in the static state of the amplifier. Some of the poor-quality amplifiers, which are easy to have noise at this time, are not worth buying, and it won't take long.
Second, when the speaker is tuned to the maximum, use the amplifier for amplification. Listen carefully to whether the amplified sound is distorted, and if the speaker is loud enough, the sound is loud enough. Such a loudspeaker is probably not a bad amplifier.
Third, loudspeaker, although appearance is not the most important factor, but the speakers work processing is a worthy of our scrutiny, if speakers do manual work is very rough, the loudspeaker majority is not mature products, the probability of occurrence quality problem is also higher.
New teaching megaphone.
The traditional teaching and amplification system is mainly wired, and the new teaching amplification system is mainly wireless, especially in colleges and universities. Wireless sound amplification system of teaching the presence of noise, sound quality distortion of the original, and the shortcoming of short transmission distance, but the later development of infrared wireless audio transmission technology, to a great extent, improved on the new teaching amplifiers.