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I. signal source

功放的作用就是把微弱的電平信號源放大輸出給音箱，然后由音箱里的喇叭單元的振動的頻率快慢來發(fā)出各種頻率的聲音，也就是我們聽到的高、中、低音，如果信號源有雜音（失真）或通過壓縮以后丟失了某些信號成分，通過功放功率放大以后，這些雜音就會放大的更大，丟失的成分就放不出來，所以在我們評價音響時用的音源好壞很關鍵

The function of the power amplifier is to amplify and output the weak level signal source to the speaker, and then send out sounds of various frequencies according to the vibration frequency of the speaker unit in the speaker, that is, the high, medium and low tones we hear. If the signal source has noise (distortion) or some signal components are lost after compression, after amplification by the power amplifier, These noises will be amplified more, and the lost components will not be released, so the sound source used in our evaluation of sound is very important

二·器材本身

II. Equipment itself

也就是說功放要信噪比高、有效頻響要寬、失真度底，音箱有效頻率要寬、頻響曲線要平坦，頻響能達到20Hz--20KHz的音響可以說是很不錯的，目前一只音箱能達到20Hz--20KHz+3%dB的是少之又少，市面上有好多音響說高頻能達到30甚40KHz,這說明音響品質是在不斷的進步，但是我們正常人的耳朵超過20KHz以上的信號是很難分辨出來，所以追求一些我們聽不到的高頻也沒必要，只有頻響寬曲線平坦才能逼真的再現(xiàn)原聲，功率方面就要看使用面積的大小而定，要成正比，如果面積太小功率太大，聲壓一大就會造成太多的反射聲，使音色變得渾濁不清，反之則聲壓不夠。功放功率比音箱功率在阻抗匹配時大20％到50％這樣低音會結實有力些，中高音層次會較清晰，聲壓大時沒那么容易失真

In other words, the power amplifier should have high signal-to-noise ratio, wide effective frequency response and low distortion. The effective frequency of the speaker should be wide and the frequency response curve should be flat. The sound with frequency response of 20Hz-20KHz can be said to be very good. At present, few speakers can reach 20Hz-20KHz + 3% dB. There are many sound systems on the market that the high frequency can reach 30 or even 40KHz, indicating that the sound quality is constantly improving, However, it is difficult to distinguish the signals above 20kHz in our normal ears, so it is not necessary to pursue some high frequencies that we can't hear. Only the wide frequency response curve is flat can we reproduce the original sound realistically. The power depends on the size of the use area, which should be in a positive ratio. If the area is too small and the power is too large, a large sound pressure will cause too many reflected sounds, Make the timbre turbid, otherwise the sound pressure is not enough. The power amplifier power is 20% to 50% higher than the speaker power in impedance matching, so that the bass will be stronger, the middle and high levels will be clearer, and it is not so easy to be distorted when the sound pressure is high

三·使用者本身

III. users themselves

有些人買音響是為了擺設，有些人是為了欣賞音樂、還有一種是為了顯耀，簡單點說如果一個人如果連高低音都分不清楚的話，能聽出什么是好的音質嗎？除了會聽還得會用，有些人音響裝好后，安裝技師調好效果簡單講講，結果是有不小心誰好奇去動了一些旋鈕，效果大家就可想而知了，這里并不是說要懂什么技術，就像我們開車一樣起碼要弄懂各個開關、按鈕、旋鈕是什么作用，才能發(fā)揮這個車的性能和使用安 全。

Some people buy stereos for furnishings, some people for music appreciation, and others for fame. To put it simply, if a person can't distinguish between high and low tones, can he hear what good sound quality is? In addition to being able to listen, some people have to be able to use it. After the stereo is installed, the installation technician adjusts the effect and gives a brief talk. As a result, one day, someone accidentally moves some knobs, and the effect can be imagined. This is not to say that we need to understand any technology. Just like driving, we should at least understand the function of various switches, buttons and knobs, In order to give full play to the performance and safety of the car.

四·使用環(huán)境

IV. use environment

大家都知道空房間沒住人時，擊掌、說話時回音特別大，這是因為房間六面沒有吸音材料或吸音不夠，反射聲造成的。音響也一樣，如果吸音不好放出來的聲音就不好聽，尤其是聲音稍大就會很渾濁刺耳，當然有些人說家里不可能搞的象試音室一樣，其實只要下一點心思、花點錢就能搞好比如：在面積較大的墻面掛一幅刺繡圖畫有好看又吸音，玻璃窗掛厚一點的棉質窗簾，在就是地面上鋪地毯，哪怕是地面中間鋪一塊裝飾地毯效果都會出人意外，如果要做的更好可在墻上或頂?shù)跻恍┸浶圆还饣难b飾品，既美觀，又減少反射，一舉兩得。

We all know that when there is no one living in an empty room, the echo is particularly loud when clapping and talking. This is because there is no sound-absorbing material on the six sides of the room or the sound absorption is not enough, resulting in the reflected sound. The same goes for the sound system. If the sound absorption is not good, the sound released will be bad, especially if the sound is a little loud, it will be very turbid and harsh. Of course, some people say that it is impossible to build a professional sound testing room at home. In fact, it can be done well as a little thought and money. For example, hanging an embroidered picture on a large wall has good-looking and sound absorption, and hanging thicker cotton curtains on the glass window, If you want to do better, you can hang some soft and unsmooth decorations on the wall or top, which is not only beautiful, but also reduce reflection and kill two birds with one stone.