Subwoofer: 20Hz-40Hz, with strong sound when appropriate. Can control thunder, bass drum, organ and bass. Excessive ascension will make music turbid. Bass: 40Hz- 150Hz, which is the basic part of sound, and its energy accounts for 70% of the whole audio energy, and it is an important part of expressing music style. When appropriate, the bass is relaxed and the voice is full and soft. When it is insufficient, the voice is low, 150Hz. When it is raised excessively, it will make the sound dull, reduce the brightness and enhance the nasal sound. Bass: 150Hz-500Hz, which is the structural part of sound. The sound is in this position. When it is insufficient, the singing voice will be drowned out by the music, and the voice will be very soft and weak. When it is properly lifted, it will feel energetic and powerful, and improve the intensity and loudness of the sound. Excessive lifting will make the bass stiff, and the excessive lifting will be 3-6dB at 300Hz. If reverberation is added, the clarity of sound will be seriously affected. Midrange: 500Hz-2KHz, including the lower harmonics and overtones of most instruments, is the characteristic sound of snare drum and percussion instruments. The sound is clear and bright when it is appropriate, and hazy when it is insufficient. Excessive lifting will produce a sound similar to a telephone. Tenor: 2KHz-5KHz, which is the characteristic sound of strings (the rubbing sound between the bow and the strings when pulling strings, and the sound of fingers touching the strings when playing music). When it is insufficient, the sound penetration will be reduced, and when it is too strong, it will cover up the recognition of language syllables. Treble: 7KHz-8KHz, which is the frequency that affects the sound layering. Excessive promotion will make piccolo and flute sound prominent, the tooth sound of language will be aggravated, and the timbre will be hairy. Extremely high sound: When 8KHz- 10KHz is appropriate, the metal permeability of triangle iron and vertical * is high, and the rhythm of sand clock is clear and recognizable. Excessive lifting will make the sound unnatural and easily burn out high-frequency units. 2. A balanced and pleasant sound should be: 150Hz (bass) should be plump, soft and elastic; 150Hz-500Hz (bass) should be vigorous and powerful; 500Hz-5KHz (medium and high notes) should be bright and thorough without being stiff; Above 5KHz (treble) should be thin, round and not sharp. When the overall frequency response is flat: the sound is naturally full and elastic, and the level is clear, round and pleasant. When the frequency response is multi-peak and valley, the sound is rough and muddy, and the treble is harsh and hairy. The amplification without layering is prone to feedback howling. 3. Sound sense characteristics of frequency: 30~60Hz is rather dull, without considerable loudness, which is difficult for human ears to feel. 60~ 100Hz can produce a strong "heavy feeling" effect near 80Hz, and the loudness will not give people a comfortable feeling, but can give people a strong stimulus. 100~200Hz fullness 200~500Hz force is easy to cause buzz and boredom. If 10dB is increased around 500~ 1KHz, there will be obvious noise and narrowness. 1K~2KHz is bright, and the brightness around 2800Kz has the greatest relationship. 2K~4Kz sharp 6800Hz forms a sharp and harsh feeling. 4K~8Kz brittle 3400Hz is easy to cause hearing fatigue. 8K~ 16Kz is slender > > 7.5KHz is clear and slender. If there is no ear adjustment for musical instruments, the sound turbidity will be reduced by 60-80, the bass ear pressure will be reduced by 125, the midrange thickness will be reduced by 400,500, the midrange ear beat will be reduced by 1250-2000, the voice will be reduced by 3K, the high-frequency harshness will be reduced by 8K, and the treble hair will be reduced by 65,433. Conversely, if the low frequency is not full, it will be added. If the strength is insufficient, add125; If the voice is low, add 200-400; If the sound is weak, add1k; If the voice is backward, add 3k; If the sound is not bright, add 4-8k; If the sense of space is insufficient, add 12- 16k. The bass is too hard to reduce 160-200, the male voice is reduced by 200, and the nasal sound is reduced by 250. What is this? Try to use attenuation, not ascension, and subtract unnecessary things, and the natural level will be clear. If you really feel something is missing, it is usually caused by the indoor environment or the placement of speakers. Too much lifting will change the sound floor of the speaker and destroy the sound quality. Remember, sound reinforcement is art, and all art is flawed and can't be perfect. KTV Andhadhun Audio Operation Training I. Power Amplifier Panel Name Function Understanding: 1: Total reverberation volume: ECHO or ECHO VOL This knob can control the direct sound size of reverberation echo, that is, the whole reverberation effect is more or less! Note: There are two function knobs used together with this function-repetition (the length of reverberation repetition) and delay (the knob can adjust the length of reverberation echo extension time). These three function knobs must be used together, and none of them is indispensable, otherwise the effect is not ideal. If you want to debug a satisfactory effect, you must tune it together and feel it again and again! 2. Total microphone volume: The MIC VOL knob can control the volume of all microphones. Note: There are three microphone volume control knobs under the total microphone volume, which can control the volume of each microphone: MIC 1 (microphone 1 volume) MIC2 (microphone 2 volume) MIC3 (microphone 3 volume) 3: total music volume: MUSIVOL This knob can control the volume of computer accompaniment. Adjust this knob to achieve the sound level of the song. 4. Sound quality control: microphone bass, microphone treble, microphone bass, microphone treble, 5. Balance between left and right channels: Balance This knob must be set in the middle. Otherwise, the sound emitted by the left and right speakers is different in size. 2. Tuning skills: 1: About microphone howling Usually, microphone howling is caused by excessive microphone volume. Take a closer look at whether the total microphone volume is too high or the volume of a single microphone is too high. Another reason for the microphone howling is that the sound quality of the microphone is too high. Listen carefully to the howling frequency: the harsh howling is caused by the high pitch of the microphone, so the high pitch of the microphone must be lowered. If it is a low whistle, the whistle that feels a little vibration is caused by too much microphone bass, so the microphone bass must be lowered. 2. In general, that is, during business hours, if a guest requests to adjust the reverberation, try not to adjust the repetition or delay in the reverberation effect, just increase or decrease the ECHO VOL! 3. The volume control of computer music accompaniment should not cover the voice of guests singing. Otherwise, guests will feel that singing is very hard, very hard and laborious. 4. Another key problem in tuning technology is the matching of microphones. If the microphones in a box are not of the same brand, their frequencies will be different. Simply put, the sound quality of the microphone is different. If their sound quality is different, it will be difficult for us to tune them. When you take care of the sound quality of this brand of microphone, the sound quality of another brand of microphone will not be reflected. Mispairing of microphones can also easily lead to microphone howling, so the microphones in our box must be unified and have the same sound quality. We must pay special attention to this point in our work, and we are not allowed to have mismatched microphones! 5. Good audio equipment is embodied in-good singing skills: singing is not difficult; Clear treble and bass: distinct layers; Reverberation effect: be natural, not dry or too long, and the echo is too loud! Don't cover the human voice when the guests sing with music! Three. Responsibilities of the audio department for the operation and maintenance of audio equipment: 1: Before the operation, always check whether there is poor contact with the microphone connecting cable in the private room. When changing microphones at ordinary times, the microphones must be paired! 2. Be sure to check the tweeters and woofers of the private room speakers before business. If there is any damage, please repair and replace them! Try to maintain and save costs for the company! Be sure to check the computer song ordering system in the private room before business to see if it can order songs normally. And pay more attention to individual songs with poor accompaniment, and register them to solve them! 4. Listen carefully to the suggestions of various departments of the company on the work of the audio department and do your best to do a good job. Usually, first listen to the information of the guest's request for adding songs, and then report to the supervisor. The sound department must ensure the normal business of each box, except in special circumstances! 6. Do a good job in maintenance and delivery registration, do a good job in the replacement of accessories and parts and the delivery registration of equipment, such as the replacement of treble/bass units, etc. 7; Open-minded and eager to learn, you can ask your superiors for answers and help when you encounter things and work problems you don't understand at work! 8. With the help of the supervisor, after the audio equipment in the box is debugged to the best state, paste the debugged scales to the ideal position with the arrow label, mark them well, and operate the audio equipment along the arrow direction at ordinary times, so that the audio can be debugged to the best state, even if it is changed at the request of the guests, it can be reset at any time! Usually it is the light and heavy reverberation effect required by the guests, just adjust the ECHO VOL to the scale that the guests are satisfied with! After the guest leaves, you can reset the reverberation echo VOL to the position of the arrow label! 9. In business, when equipment is damaged, replace the bad equipment with good equipment by substitution method, and then repair the bad equipment in free time. 10: inspect the box frequently to avoid burning the audio equipment due to excessive sound.