Eq的调节（The regulation of Eq）Due to the resonance characteristics of the room, sound absorption materials on the sound absorption coefficient of sound frequency and frequency response characteristics of the speaker system is not even a reason, can cause a certain frequency sound intensity and the problem of shortage of certain frequency of sound. Therefore, the frequency response of the room must be adjusted.Balanced room there are two ways: the human ear listening results adjustment, difficult, not easy to master, must have a wealth of practical experience and are familiar with the program, and adjust the size of the sound pressure level, and listening is also linked to a persons age. Another method is to use pink noise source and audio frequency spectrum instrument for objective measurement and adjustment.1. Adjustment of equalizer:Ultra low: 20hz-40hz, strong and powerful when appropriate. Can control the sound of thunder, bass drum, pipe organ and bass. Excessive ascension will make music cloudy.Bass: 40Hz - 150Hz, the basic part of sound, which accounts for 70% of the total audio energy, is an important component of music style.When appropriate, the bass is well-suited, the sound is plump and downy, the voice is thin, the voice is thin, 150Hz, the sound is dull, the brightness drops and the nasal tone increases.Bass: 150 hz - 500 hz, is the structure part of the sound, the position of the human voice, is insufficient, the singing sound will be submerged by music, voice soft and weak, ascension will feel vigorous powerful, appropriate to improve the strength and the loudness of sound. Excessive lifting of the bass will cause the bass to become stiff, and 300Hz will be over-promoted by 3-6db, which, if combined with reverberation, will seriously affect the clarity of the sound.Alto: 500hz-2khz, which contains low harmonics and overtones of most instruments. It is the characteristic sound of a small drum and percussion instrument. The sound is clear and bright when appropriate, and the sound is hazy when it is insufficient. An overlift produces a similar call.Tenor: 2KHz - 5KHz, which is the signature of the strings. (the string of the bow and the string of the string, the sound of the fingers touching the strings.) The penetrating power of the voice is decreased when the voice is insufficient, and the recognition of the language syllables will be masked when overstrong.High pitch: 7khz-8khz, is the frequency that affects the sound level. Excessive promotion will make the short flute, flute sound prominent, the languages tooth tone is accentuated and the tone hair.High pitch: 8khz-10khzWhen appropriate, the metal inductance of tri-iron and vertical fork is high, and the rhythm of the sand clock can be clearly discernible. Excessive lifting can make the sound unnatural and burn high frequency units.2. The harmonious sound should be:150Hz below (bass) should be plump, soft and elastic;150hz-500hz should be thick and strong and not cloudy;500hz-5khz (medium-high) should be bright and thorough without stiffness;Above 5KHz (high) should be slender, the garden is smooth and not shrill.When the whole frequency is flat, the sound is naturally plump and elastic, and the structure is smooth and pleasant. The frequency of the peak valley: the sound is coarse and turbid, the high notes are harsh, and the sound of laminar expansion is easy to give feedback.3. Acoustic characteristics of frequency:30 60Hz is dull if not quite loud, the ear is hard to feel.60 100Hz weighs 80Hz. It can produce a strong sense of heavy feeling, and the loudness of the sound can not make people feel comfortable.It can give people a strong stimulus.100 200 hz fullness200 500Hz is very difficult to cause buzzing.An increase of 10dB near 800 hz in the area of 500 1KHz clearly creates a sense of noise and a sense of stenosis.1K 2KHz has the largest brightness relationship near 2800Kz.2K 4Kz sharp 6800Hz forms sharp whistle, sharp sensation.4K 8Kz crisp 3400Hz is susceptible to auditory fatigue.8K 16Kz thin 7.5 KHz tone is slender.50hz - common minimum frequency.The most important frequency of this powerful drumbeat is also the frequency that enables a person to dance. By properly ascending, you will receive an exciting sound of the drum. But, be sure to cut out all the 50hz sounds in the human voice, because that must be the sound of the jet.70 100hz - this is a necessary frequency point for a thick, powerful BASS, and also a frequency point for the removal of a human voice.Also note that BASS and ground drums do not ascend the same frequency, otherwise the drums will be buried.The 200 400hz - frequency band has the following main USES:First, it is the wooden voice frequency band of the military drum;Secondly, this is the frequency band that eliminates the feeling of human voice.