The difference between professional audio and household stereo is the difference in the use of places.

Household acoustics is generally used for indoor broadcasting, which is characterized by delicate and soft sound quality, exquisite and beautiful appearance, low sound pressure level, relatively less power to bear, and the scope of sound transmission is small. Professional acoustics generally refers to the use of music and dance halls, karaoke halls, theatres, theatres, conference rooms and stadiums and other professional entertainment venues, according to different venues, different voice requirements, venue size and other factors, configuration of different venues sound system solutions.

I. home acoustics

Configuration of common household audio system

1. Sound Source: Sound Source. The common sound sources in home sound system are cassette recorder, CD player, LD player, VCD player and DVD player.

2. Amplifier: In order to effectively launch the loudspeaker sound, the output signal of the sound source usually needs power amplification. Now the common amplifier is AV power amplifier, generally transistor power amplifier, but now some enthusiasts are also fond of tube amplifier.

3, reecho equipment: namely the speaker, its performance will directly affect the sound effect.

4, connecting line: including the connecting line from sound source to power amplifier and the connecting line of amplifier to speaker.

Basic requirements for household audio system

1. requirements for household audio equipment

The ultimate goal of a home audio system is to achieve the desired audio effect, such as the sound effect of a movie theater at home. But the family is different from the theater, so to appreciate different nature of sound, the requirements of acoustics are different, pop music, classical music, light music and other requirements can correctly restore a variety of musical instruments, but to appreciate the film, but requires a sound effect of the scene, surround the feeling and so on. For the sound source, the preferred DVD, because DVD is a pure digital design, mostly equipped with AC-3 interface, can directly form a Dolby surround sound system with AC-3. CDs are good, but be aware that different sound sources end up with different sound effects (even if the devices behind are exactly the same). For the power amplifier, it is required to have many pairs of input and output terminals (if a home theater system is set up, at least 6 pairs), have a larger power output, impedance to match. The requirements for speakers, the power can be a little smaller, because the use of general household does not need high-power output, but the sensitivity of the speaker, directional characteristics, frequency response characteristics should be higher requirements, it is best to use full-frequency speakers, enough power. Connection lines are the most easily ignored by enthusiasts, but facts have proved that their impact on sound effects can not be ignored, its frequency characteristics, shielding characteristics must be good.

2. requirements of home audio system for listening environment

For ordinary families, the living room is the listening room. Due to the limitation of objective conditions, it is impossible to adjust the proportion of the listening environment. However, under the existing size conditions, how to make the best listening effect is considered: 1. The symmetry of the listening environment includes two aspects, namely, auditing symmetry. Symmetrically, geometrically symmetric and sound settings should be geometrically symmetrical. Acoustic symmetry means that the acoustic conditions near the symmetrical speaker box are basically the same, including the direct sound, reflection and absorption characteristics of sound waves should be consistent, which requires the choice of decorative materials, furniture layout should meet the sound of good acoustic characteristics.

Two, professional audio.

Configuration of general professional audio system

1, sound source (music player, pickup device, microphone).

2. Control equipment (analog mixer, digital mixer, digital audio media matrix, AV digital management center)

3. Peripheral equipment (processor, equalizer, voltage limiter, frequency divider, exciter, delayer, effector, feedback suppressor)

4, reduction equipment (speaker or loudspeaker system, power amplifier, that is, power amplifier).

5. Connecting wires (the above equipment is made up of various types of wires and cables in series to form a unified sound system. )

Professional sound system is designed to professional terminology.

1. Sound pressure level

The value of 20 times the ratio of the actual sound pressure to the reference sound pressure is decibel. It is an important index to measure the sound condition of the sound system and the acoustic quality index of the sound reinforcement room.

2. amplifying power

The sound reinforcement power refers to the rated power required by the sound reinforcement equipment when it reaches the rated sound reinforcement pressure level of the system design. Its unit is tile. It is the direct embodiment of acoustic parameters, and it will be related to the final cost of the project, so it is particularly important.

3. hum

50 Hz AC electric sound, because the sound for low-frequency and humming similar to the name, audio equipment power ripple coefficient too large and anti-interference performance will lead to humming.

4. pure tone

The sound of a sinusoidal signal, audibly having a distinct single tone, such as the sound of a tuning fork.

5. intermodulation distortion

Intermodulation distortion (IMD) is a signal distortion in which two mono-tone signals with a certain amplitude ratio (usually 4:1) are replayed by a playback device to produce a new frequency component.

6. octave

There is an octave pitch relationship between two frequencies compared to two tones, i.e. the pitch increases by one octave with each doubling of the frequency.

7. frequency divider

A circuit device in a speaker box for separating input music signals into different parts, such as high, medium, and low tones, and then feeding them into corresponding high, medium and low-pitch speaker units for playback.

8. dual amplifier Division

Every speaker in the box.