How to distinguish between low frequency and medium frequency RGB desktop speakers
author: huang
2022-09-22
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How to distinguish between low frequency and medium frequency RGB desktop speakers
Everyone will say that the high pitched sound of this pair of RGB desktop speakers is too strong and the low pitched sound is too little. This is the quantitative dispersion in the high, middle and low frequency bands. The problem is that if the bandwidth from 20Hz to 20KHz is divided into three segments, it will inevitably lead to "inaccurate" confusion. Where does your low voice mean? How low? In order to make the description more accurate, it is necessary to subdivide the 20Hz-20kHz bandwidth.
According to the division method of TAS and Stereophile in the United States, they subdivide each segment of high, medium and low into three segments, which is the division method of "lower intermediate frequency, intermediate frequency and higher intermediate frequency". This kind of division is like the law of twelve averages, which is quite regular. However, when it is applied to Chinese people, there are some translation problems. For example, is the "lower intermediate frequency" what we call "middle low frequency" or "low intermediate frequency"? What about the higher low frequency? High and low frequency? As far as Chinese people are concerned, this kind of division of foreigners may not work. So long ago, referring to the bandwidth of musical instruments and the name of the orchestra for movement and stillness, I divided the frequency of 20Hz-20KHz into seven segments: extremely low frequency, low frequency, medium low frequency, medium frequency, medium high frequency, high frequency and extremely high frequency. The nouns in these seven paragraphs conform to the customary titles of ordinary Chinese people and are easy to remember and will not be confused.
ELF
The octave from 20Hz to 40Hz is called ELF. There are few musical instruments in this frequency band. Only the low voice violin, low voice bassoon, tuba, organ, piano and other instruments can reach such a low range. Because this extremely low frequency is not the range of an instrument, composers rarely write notes that low. Unless pop music is deliberately organized with an electronic synthesizer, ELF is not really useful for audio fans. Some people mistake an assignment, saying that although the pitch of the instrument is not that low, the overtones can be as low as the pitch. This is not correct. Because the pitch of the instrument is the sound of the sound, the sound will only be doubled, tripled, quadrupled, or quintupled? Wait and climb up without any downward sound. It's like you tighten a string, and the full length vibration frequency of the string is the pitch, one half, one third, one quarter, one fifth? Vibrations of equal chord length are overtones. The combination of pitch and overtone is the timbre of an instrument. In other words, even if the pitch (pitch) of violin and flute is the same, the timbre will be different.
Low frequency
The frequency from 40Hz to 80Hz is called low frequency. What instruments are there in this band? Drum, low violin, cello, low bassoon, bassoon, low elastic horn, low clarinet, tuba, French horn, etc. This frequency band is a great contributor to the sincere low-frequency foundation. Generally, people mistake this frequency band for ELF because it sounds really low. If the sense of quantity in this frequency band is too little, there must be no feeling of abundance and surging; And it will lead to the prominence of medium and high frequencies, which will make the movement and static lose the sense of balance and make it not durable to listen.
Medium low frequency
From 80Hz to 160Hz, I call it medium low frequency. This frequency band is the most troublesome one for Taiwan audio fans, because it is the culprit of ear boom. Why does this frequency band have a peak value? This is related to the length, width and height of the small room. Most people try their best to absorb this frequency band in order to remove this annoying peak, so that their ears will not be roaring. Unfortunately, when your ears don't sound loud, I'm afraid that the lower low frequency and the upper intermediate frequency have become sunken with the absorption of the middle and low frequency, which makes the movement thinner and lacks the sense of fullness. What is more unfortunate is that most people think that this scene is right only because the peak value disappears. This is one of the reasons why there is not enough activity in many families. The instruments in this frequency band include the instruments mentioned in the low frequency band just now. By the way, the timpani and male low voice should also be added.
intermediate frequency
The frequency from 160Hz to 1280Hz spanning three octaves (320Hz, 640Hz, 1280Hz) is called intermediate frequency. This frequency band almost includes all musical instruments and vocals, so it is the frequency band of. This is also where readers misunderstand the instrument's range. For example, most of the violin's range is in this frequency band, but most people mistakenly believe that it is very high; Don't think that the soprano has a very high range. Generally speaking, her range is only at the upper limit of the mid frequency.
From the above description, you must also understand how important this intermediate frequency is in sound. As long as this frequency sag, the dynamic and static expression will become thinner immediately. Sometimes, such thinness is simply explained as "false cohesion". I believe that a lot of audio fans are in the situation of mid frequency depression without knowing it. The importance of this frequency band can also be analyzed from the frequency division point of the two tone channel horn. Generally, the frequency division point of two tone speakers is about 2500Hz or 3000Hz, that is to say, the tweeter unit acts as the frequency division point above 2500Hz, and the middle and low speaker unit acts as the frequency division point below 2500Hz. This 2500Hz is about twice as high as 1280Hz. That is to say, in order to avoid the excessive distortion of the crossover point at the intermediate frequency caused by the medium and low sound monomer, planners generally raise the crossover point to twice the upper limit of the intermediate frequency, so that the most intermediate frequency can be announced by the medium and low sound monomer. If this statement is correct, what's the use of treble monomer? If you ever put your ear close to the treble unit, you will hear a "hissing" sound, which is where most overtones are. If there is no hissing sound announced by the treble single, it must be gloomy to sing music with a medium low voice single. Of course, if it is a three tone speaker, most of the intermediate frequencies will be included in the intermediate monomer.RGB desktop speakers
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