The difference between professional audio and home ordinary audio lies in the different places of use.
Home audio is generally used for home indoor playback, which is characterized by delicate and soft sound quality, more delicate and beautiful appearance, the sound pressure level is not too high, the power is relatively small, and the range of sound transmission is also small. Professional audio generally refers to professional entertainment venues such as dance halls, karaoke halls, theaters, conference rooms and stadiums, according to different places, different sound requirements, venue size and other factors, configure different places of audio system solutions.

One. Home audio common home audio system configuration composition
1, sound source: that is, the source of sound, common sound sources in home audio
system are cassette recorder, CD player, LD player, VCD player and DVD player.
2, amplification equipment: in order to effectively launch the speaker sound, the signal output by the audio source is generally to be power amplified, now the common amplification equipment is AV power amplifier, generally for transistor power amplifier, but now some audiophiles also love tube amplifiers.
3. Reproduction equipment: that is, speakers, the performance of which will directly affect the listening effect.
4. Connecting cable: including the connection line from the audio source to the power amplifier and the connection line from the power amplifier to the speaker.

Basic requirements
for home audio systems
1. Requirements
for home audio equipment The ultimate pursuit of home audio systems is to obtain ideal listening effects, such as enjoying the acoustics of movie theaters at home. However, the family is different from the theater, so the acoustic effect required for enjoying different types of sound is different, and the requirements for pop music, classical music, light music, etc. can correctly restore various musical instruments, but for enjoying the film, it requires a sense of scene and enveloping with sound effects. For the audio source, you can choose DVD, because the DVD is a purely digital design, most of them are equipped with AC-3 interface, which can directly form a Dolby surround sound system with AC-3. CD players are also good, but be aware that different sources end up with different acoustics (even if the equipment behind them is exactly the same).
For power amplifiers, it is required to have multiple pairs of input and output terminals (if a home theater system is formed, at least 6 pairs), have a large power output, and the impedance should be matched.
The requirements for speakers, the power can be a little smaller, because the use in the family generally does not need high power output, but the sensitivity, pointing characteristics, frequency response characteristics of the speaker should have higher requirements, it is best to use full-range speakers, the power is enough. Connecting cables are the most easy for audiophiles to overlook, but it turns out that their impact on sound effects must not be ignored, and their frequency characteristics and shielding characteristics must be good.
2. Requirements of home audio system for listening environment For ordinary families, the living room is a listening room, due to the limitation of objective conditions, the proportion of the listening environment can no longer be adjusted, but under the condition of the existing size, how to make the best listening effect is a problem to consider: (1) The symmetry of the listening environment

, this symmetry includes two aspects, namely audit symmetry and acoustic symmetry, Both geometric symmetry and sound settings should be geometrically symmetrical. Of course, listen to the sound as a reference point; Acoustic symmetry means that the acoustic conditions near the symmetrical speaker are basically the same, including the direct illumination of sound waves, reflection and absorption characteristics of sound waves should be consistent, which requires the selection of decorative materials and the arrangement of furniture to meet the good acoustic characteristics of listening.

Second, professional audio
The configuration of the general professional audio system consists of
1, audio source (music playback equipment, pickup equipment that is the microphone)
2, control equipment (analog mixer, digital mixer, digital audio
media matrix, AV digital management center).
3. Peripheral equipment (processor, equalizer, limiter, frequency divider, exciter, delayer, effect, feedback suppressor) 4.
Restore equipment (speaker or speaker system, power amplifier, that is, power amplifier).
5. Connection cable (The above equipment is connected by various types of different wires and cables in series to form a unified audio system.) Professional
audio systems are designed to the professional term
1, sound pressure level
refers to the 20 times the ratio of actual sound pressure to the base sound pressure, the unit is decibels. It is an important indicator to measure the sound generation of the sound system and the acoustic quality index of the sound reinforcement place.
2. Sound reinforcement power: Sound reinforcement power refers to the rated power
required by sound reinforcement equipment when the rated sound pressure level of the system design is reached. Its unit is watts. It is a direct reflection of acoustic indicators in electroacoustic parameters, and it will be related to the final cost of the project, so it is also particularly important.
3. Hum
50 Hz mains AC sound, because the sound is similar to the low frequency and hum and get the name, the power ripple coefficient of the audio equipment is too large and the anti-interference performance is poor, etc. will lead to hum.
4. The sound of pure sinusoidal
signal, which is audibly a sound with a clear single tone, such as the sound emitted by a tuning fork.
5. Intermodulation distortion: Intermodulation distortion refers to a signal distortion
that produces a new frequency component after two single audio signals with a certain amplitude mixed in a certain proportion (usually 4:1) through the playback device.
6. The
octave between the two frequencies is compared with the frequency range between the 2 sounds, and the pitch relationship between the double frequency is octave, that is, for every doubling of the frequency, the pitch increases by one octave.
7. A circuit device in the crossover
speaker to separate the input music signal into different parts such as treble, midrange, and bass, and then send it to the corresponding high, mid, and woofer units for replay.
8. Each speaker unit of the dual-amplifier
crossover is driven by an independent amplifier channel. A pair of two-way speakers requires the use of two stereo amplifiers and two pairs of speaker cables. See "Two-line splitting".
9. Two-line crossover
is a wiring method that uses two sets of speaker wires to transmit the high and low parts of the music signal respectively. Two-wire splitting requires specially designed speakers with two pairs of terminal blocks.
10. Collective term for amplifier preamplifier and power amplifier
.
11. Power amplifier, referred to as power amplifier
, is an electronic device used to enhance signal power to drive speaker sound. Power amplifiers without auxiliary functions such as source selection and volume control are called post-stages.
12. The preamplification and control section before the preamplifier
amplifier amplifier is used to enhance the voltage amplitude of the signal, provide input signal selection, tone adjustment and volume control and other functions. Preamplifiers are also known as preamplifiers.
13. Combined amplifiers
combine two parts, preamplification and power amplification, in a single chassis.
14. Another term for a bile machine
tube amplifier.
The system configuration of professional audio needs to be configured by professionals to design special audio system engineering solutions according to the different requirements of different occasions. Let's take a look at general solutions for conference systems engineering.
Conference sound system engineering solution
Conference sound system engineering refers to the integration of sound, light, electrical equipment and software related to the conference. Conference system design covers all of these aspects. The integration of conference systems is through careful analysis and understanding of customer needs, execution of planning and design projects. Use technology to best solve problems and provide maximum value to customers. Achieve the desired results within budget, within expectations. The result is a satisfied user.
Typical conference sound systems include conference sound system (CMS) and conference discussion system (CDS), conference transliteration system (CIS), language allocation system (LDS) and conference voting system (CVS). Before the conference is designed, research and investigation are carried out. Carry out scientific design planning. The issues to be considered in the planning of the conference system include: the purpose of using the conference system, the level of the conference system composition, the scope of services, the ability of conference management, and the thinking of the international application environment, etc.!

Generally, a meeting can be divided into: 1 Report mode:
one person speaks and everyone listens, and the host listens to everyone, and everyone faces each other. The basic investment in general sound reinforcement depends on the floor area of the conference room.
2 Speech mode: The sound reinforcement form is similar to the report mode, but the audience should prepare the audience's questions to be amplified. The video should have a display system.
3 Discussion mode: round table sitting meeting format, can have order speech control, each person speaking time control. It can also extend the voting system, simultaneous interpretation and other functions. The more features, the greater the investment cost.

Scheduling meeting mode:
more emphasis on multi-screen, multi-information display. Local and off-site communication can also be emphasized. and distribution and recording of resolutions. The cost of the investment depends on the specific requirements of the content. But thisOften the working conditions must be configured. Multimedia teaching and training: Based on the physical environment of multimedia conference, teaching software is added. Courseware distribution, homework submission, teacher visit, individual Q&A, examination paper evaluation and other functions. Of course, language training can also be added. Conference broadcast mode: It is a one-way mode in the joint meeting mode, that is, the sound and image of the main venue can only be received in the sub-venue. And the main venue does not have any information about the sub-venue. It is a joint meeting mode, easy mode.

Multimedia conference mode:
more use of video display system in the form of conference sound reinforcement, such as multi-screen single-screen display, multi-screen multi-information display. Round table regulator information display.
There are different forms such as automatic tracking of camera speeches and recording of computer image signals. The more features, the greater the investment cost.
Different modes of device configuration are different. However, it is not necessary to require all kinds of functions, because the building structure and desktop form may determine to limit some requirements. Other auxiliary devices provide more convenient control, transmission and display functions. Multi-function is not as good as dedicated.
Specific features of the main equipment of the conference audio system: simultaneous interpretation conference system, dimming system, projection/display system, multimedia conference control system, audio transmission and control system, sound reinforcement processing system, environment, lighting control system, etc.
In addition, each different venue has different requirements and solutions for professional audio. Professional audio equipment has high requirements for users, and has a very good understanding of the functions and use of various equipment, with professional theoretical knowledge, accurate listening ability, strong debugging level, and emphasis on fault diagnosis and troubleshooting. A well-designed professional audio system should not only focus on the design and debugging of the electroacoustic system, but should consider the actual sound propagation environment and carry out accurate on-site tuning in it, so the difficulty lies in the design and debugging of the system.