Audio is a complete set of audio systems that emit sound through a combination of electrical equipment. The more common ones are wireless audio, car audio, home theater audio, etc. Most home audio only use the speaker equipment in the audio, so many people directly The speakers are called speakers. When purchasing audio, pay attention to some of its basic parameters, including channel, sensitivity, etc., and also pay attention to the selection of audio brands. Generally, the purchased audio equipment cannot be used directly, and can only be officially used after steps such as placement, debugging, and power-on. Let’s learn how to use the speakers together!
Introduction to audio expertise The composition of audio system
1. Audio source
Audio source equipment includes DVD, CD, MP3, MP4, computer, mobile phone, microphone, etc. The source output device, which is well understood, is the source of the sound.
2. Audio signal dynamic processing equipment
This part of the equipment includes compressors, effects, mixers, audio processors, equalizers, etc. , mainly to modify the sound quality and process the sound effect of the multi-channel input signal.
3. Audio signal amplification equipment
The amplification equipment includes analog power amplifiers such as pre-stage power amplifiers, post-stage power amplifiers, digital power amplifiers, etc. The low-level signal sent by the sound source is amplified to push the speaker to sound.
4. Peripheral processing equipment
Including speaker cables, signal cables, power cables and other accessories and other accessories, it is the connection bridge between audio systems.
5. Sound restoration equipment
This part of the equipment includes ceiling speakers, sound columns, line array speakers, array speakers, tweeters, speaker bass Cannons, etc., they are to restore the processed sound electronic signal into sound output.
The working principle of audio
Simply put, the sound is converted into electrical energy first, and then after signal processing, the electrical energy is converted into sound output to improve the sound quality.
The type of audio
According to the occasion of use, it can be divided into car audio, home audio, KTV audio, square dance audio, stage audio, bar audio, conference room audio, etc.;
According to the structure of the box, it can be divided into combination sound, inverted sound box, sealed sound, etc.;
According to the audio frequency, it can be divided into full-frequency sound, bass sound and subwoofer sound, hifi audio, etc.
Tip: There are various classification methods for audio equipment. According to different classification methods, it can be divided into various types. The above classifications are only a few common classifications.
The difference between audio and speakers
Professionally speaking, a speaker is a component of an audio system, a box with a speaker unit, but most ordinary people do not use it when using it. A complete set of audio equipment, so over time, speakers will be referred to as audio.
How to select audio and audio parameters
1, channel
2.0 channel Good treble performance, suitable for listening to music; 2.1 channel with subwoofer, suitable for watching movies and playing games; 5.1 channel is usually used for home theater; 7.1 channel is suitable for stage and theater.
2. Sensitivity
The general speaker sensitivity is around 89-90db. The higher the sensitivity, the louder the sound.
3. Dynamic range
The dynamic range of a good sound system is generally above 100db.
4. Other parameters
When purchasing speakers, we also need to pay attention to its signal-to-noise ratio, frequency response, power, impedance and distortion and other parameters.
Audio configuration schemes for different usage scenarios
1. Home audio configuration
Home audio is mostly used in desktop combination speakers, TV computer audio and home influencers Audio, etc., when purchasing, you should choose according to the characteristics of different audio.
2. Audio equipment configuration for event performances
The audio equipment for performances generally includes DVD players, power sequencers, special effects mixers, main amplifiers Audio, stage monitor, subwoofer, professional power amplifier, professional wireless singing microphone and headset, etc.
3. Conference room audio equipment configuration
Different size conference rooms have different audio equipment configurations. Equipment such as mixers, equalizers, power amplifiers, speakers and power sequencers.
Precautions for audio purchase
1. Try to listen to it before purchasing
As an audio equipment, when we purchase audio, It is best to go to the experience store to hear what the actual sound effects are like, so that the products you buy back will be more in line with your own mind. There are many audio evaluation videos on the Internet now, but the sound quality recorded by different recording equipment is different, and it is possible to repair the sound, so it is the most authentic when you listen to it yourself.
2. Try to choose branded products
As an electronic device, I suggest that you choose branded products as much as possible when purchasing. If there is a fault in the later stage, the after-sales service is also easier to deal with.
Speaker Making Tutorial
Materials Tools: Paper cups, toilet paper rolls, tape, utility knife, pencils.
Procedures:
Step 1: Place the two ends of the toilet paper tube against the side of the paper cup, then draw the shape with a pencil.
Step 2: Use a utility knife to cut along the drawn line, being careful not to cut yourself.
Step 3: Align the end of the phone with the speaker at the center of the toilet paper tube, and draw the outline with a pencil.
Step 4: Cut it in the same way.
Step 5: Then put the paper cup on the toilet paper tube, and then seal the cup with tape, being careful not to seal it completely.
Step 6: A simple DIY stereo is ready, how about it? Is not it simple?
How to use the speakers How to place the speakers well
1. Regular triangle method
The distance between the speaker and the rear wall should be more than 1 meter, and the distance from the side wall should be more than 0.5 meters, and then the left and right speakers should be placed in an equilateral triangle shape with the listening position.
A speaker placed in a regular triangle sounds the clearest and most direct.
2. The rhombus pendulum method
The rhombus pendulum method is generally only used in a square space, the square space is regarded as a rhombus, and then the speakers are placed on both sides against a wall, with the listening position in the middle of the room.
The diamond pendulum method can alleviate the strong standing wave of the bass boom in the square space, making the sound quality sound more stable.
3. Placing the speakers on the wall
Place the speakers close to the rear wall and place them left and right, and then the listening position is in the middle of the opposite wall. Can.
This pendulum method can balance the high, medium and low frequency sound effects, which is what music enthusiasts usually say “high-pitched, mid-range, sweet and low-pitched, and in a word, transparent”.
How to connect the speakers
1. How to connect the speaker cables
First, place the speakers in a good position, and then connect them. The wiring of the left and right speakers is generally connected by a card cable. Pay attention to distinguish the positive and negative of the speaker cable. The center speaker can be directly connected with the lotus head signal cable.
2. How to connect the speaker to bluetooth
First turn on the bluetooth function of the speaker, and then turn on the bluetooth function of the mobile phone or computer when the indicator light is on , and search the name of the speaker on the search page, and then click to connect. [How to use bluetooth speakers>>]
How to match speaker amplifiers
1. Power matching
In order to meet the requirements of high-fidelity listening, the rated Power should be determined based on optimal listening sound pressure.
2. Matching power reserve
The nominal rated power of the selected speaker should be three times the calculated power.
3. Impedance matching
The rated output impedance of the power amplifier should be consistent with the rated impedance of the speaker.
4. Matching of damping coefficients
The formula for calculating damping coefficient KD is: KD = rated output impedance of the power amplifier (equal to the rated impedance of the speaker) / within the output of the power amplifier resistance.
How to burn-in the speaker
1. Burn-in volume
When the speaker is powered-down, adjust the volume of the speaker to the maximum, and the sound source (player, The volume of the computer, MP3, etc.) is controlled at about 60%-75%. If the speaker quality is good, it can be increased as appropriate.
2. Burn-in time
Newly bought speakers generally need to be boiled for about 60 hours. 40 hours or so.
3. Burn-in sound source
The sound source of burn-in should choose multi-band music, such as symphony, combination of adagio and metal music, classical rock, etc. They are more suitable for cooking, and you can also use white noise for cooking.
Precautions for using the speaker
1. Pay attention to the use environment
When using the speaker, pay attention to the ambient temperature and relative humidity, and pay attention to the ambient temperature and relative humidity when using and storing the speaker. Be careful to avoid direct sunlight.
2. Pay attention to the operation method
When using the speaker, pay attention to whether the wiring is correct. Turn down the volume of the speaker to avoid damage caused by the inrush current.
3. Pay attention to circuit placement
Buying and purchasing speakers editors remind everyone to pay attention to the fact that there are many circuits for a complete set of audio equipment, we are placing When placing, be sure to place it in an orderly manner, otherwise it is easy to cause the lines to be entangled and affect the use effect.
How to clean the dust from the audio
The dust on the audio surface can be wiped with a damp rag, but the dust on the speaker is recommended to be removed with a feather, or wiped with a dry flannel. Never use a wet cloth. Wipe with a rag, otherwise it will affect the durability of the speaker and the sound of the sound.
Audio repair audio without sound
1. The speaker wiring is broken or the frequency divider is abnormal
After the speaker wiring is broken, the speaker unit has no excitation voltage, which will cause Silent failure. The frequency divider is generally not easy to break, but the lead joints are de-soldered, the frequency dividing capacitor is short-circuited and other faults may occur.
2. The speaker wire is broken
Due to the frequent vibration of the speaker cone, the braided wire is easily broken, sometimes the wire is broken, but the cotton core wire still remains connect. This braided wire is not readily available and can be replaced by a slightly longer flexible wire.
The sound has current sound
1. There are debris in the magnetic gap
If debris enters the magnetic gap, the voice coil will rub against the debris when it vibrates , resulting in a sound with an electric current.
2. Wipe the voice coil core
The position of the voice coil is not correct, and it rubs against the magnetic core, resulting in sound distortion. The position of the voice coil should be corrected during maintenance. or replace the voice coil.
Speaker squeaking
1. Bad cabinet
Poor sealing of the cabinet or improper installation of the decorative grille, etc., will cause squeaking during playback . In addition, the thinness of the box plate will cause resonance and also cause noise in the sound.
2. The paper cone is broken
If the damaged area is large, the paper cone should be replaced. If the damaged area is small, a thinner paper cone or other toughness can be used. paper repairs.
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