What is the difference between a professional audio system and a home audio system?

[Home Theater Network HDAV.com.cn] Home audio is generally used for home indoor broadcasting. Its characteristics are that the sound quality is delicate and soft, the appearance is more delicate and beautiful, the sound pressure level is not too high, and the power is relatively low. 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 sports venues. Depending on the location, the requirements of the sound are different, the size of the venue, and other factors are different. Sound system solutions for the venue.

Home audio

Common home audio system configuration

1. Sound source: the source of sound, common sound sources in home audio systems such as CD player, LP machine, DVD player, etc.

2. Amplification equipment: In order to effectively and high-power the speaker sound, the signal output from the sound source is generally amplified by power. The common amplification equipment is AV power amplifier, which is generally a transistor power amplifier, but now some enthusiasts also love the tube amplifier.

3, sound-reducing equipment: that is, the speaker, its performance will directly affect the listening effect.

4. Connection line: including the connection line from the sound source to the amplifier and the connection line from the amplifier to the speaker.

Basic requirements for home audio systems

1 pair of home audio equipment requirements

The ultimate goal of the home audio system is to get the desired listening effect, such as the sound of the theater in the home. However, the family is different from the theater. Therefore, the acoustic effects required for different sounds are different. For popular music, classical music, light music, etc., it is necessary to correctly restore various instruments, but for the appreciation of the film, it requires sound effects. Feeling of the scene, feeling of envelopment, etc.

For the sound source, be aware that different sound sources will eventually get different sound effects (even if the devices behind are identical).

For the requirements of the speaker, the power can be smaller, because the use of the home generally does not require high-power output, but the sensitivity, pointing characteristics, and frequency response characteristics of the speaker should have higher requirements.

Connection lines are the most easily overlooked, but it turns out that their effects on sound effects must not be ignored, and their frequency characteristics and shielding characteristics must be good.

2 home audio system requirements for listening environment

For ordinary families, the living room is the listening room. Due to the limitations of objective conditions, it is no longer possible to adjust the proportion of the listening environment. However, under the existing conditions, how can the listening effect be the best? Is considered the problem: 1 symmetry of the listening environment, this symmetry includes two aspects, namely, symmetry and acoustic symmetry, geometric symmetry and acoustic settings should be geometrically symmetrical. Of course, the listening sound is taken as the reference point; the acoustic symmetry means that the acoustic conditions in the vicinity of the symmetric speaker are basically the same, including the direct reflection of the sound wave, the reflection and the absorption characteristics of the sound wave should be consistent, which requires the selection of the decorative material and the arrangement of the furniture. Good acoustic properties of the listening should be met.

Professional sound reinforcement

General professional audio system configuration

1. Sound source (music playback equipment, sound pickup equipment, musical instruments, etc.)

2, control equipment (analog mixer, digital mixer, digital audio media matrix, AV digital management center, the latter two meetings use more)

3, peripheral equipment (processor, equalizer, compressor, frequency divider, exciter, delay, effect, feedback suppressor)

4. Restore equipment (speaker system, power amplifier).

5, the connection line (the above equipment is more and more used by various types of different wires and optical fibers.)

Professional audio system designed to the terminology

1. Sound pressure level: refers to the logarithmic value of 20 times the ratio of the actual sound pressure to the reference sound pressure, in decibels. It is an important indicator to measure the sound quality of the sound system and the acoustic quality indicators of the sound reinforcement.

2. Sound reinforcement power: Sound reinforcement power refers to the rated power required by the sound reinforcement equipment when the rated sound pressure level of the system is designed. Its unit is watts. It is a direct manifestation of the acoustic index on the electroacoustic parameters, and it will be related to the final cost of the project, so it is also particularly important.

3. Humming: 50 Hz electricity exchange sound, because the sound is named after the low frequency and the humming sound, the power supply ripple coefficient of the audio equipment is too large and the anti-interference performance is bad, etc., which will cause the buzzing sound.

4. Pure tone: The sound of a sinusoidal signal, which is a sound with a clear single tone, such as the sound of a tuning fork.

5. Intermodulation distortion: Intermodulation distortion refers to a kind of signal distortion in which a single audio signal whose amplitude is mixed by a certain ratio (usually 4:1) passes through the playback device to generate a new frequency component.

6. Octave: The frequency between the two frequencies compared to 2, the octave relationship between the octaves, that is, the octave is increased by one octave for each doubling of the frequency.

7. Frequency divider: A circuit device in a speaker that separates the input music signal into different parts such as treble, midrange, and bass, and then sends them to the corresponding high, medium, and woofer units for playback.

8. Dual amplifier split: A connection method in which each speaker unit of the speaker is driven by a separate amplifier channel. A pair of two-way speakers requires two stereo amplifiers and two pairs of speaker cables. See "Double Line Split".

9. Two-line crossover: A type of wiring that uses two sets of speaker cables to transmit the high and low parts of the music signal. Two-wire crossover requires a specially designed speaker with two pairs of terminals.

10. Amplifier: A general term for preamplifiers and power amplifiers.

11. Power amplifier: referred to as power amplifier, an electronic device used to enhance the signal power to drive the sound of the speaker. A power amplifier without an accessory function such as source selection and volume control is called a post stage.

12. Preamplifier: The preamplifier and control section before the amplifier is used to enhance the voltage amplitude of the signal, providing input signal selection, tone adjustment and volume control. The preamplifier is also called the preamplifier.

13. Consolidated Amplifier: An amplifier that combines preamplifier and power amplification in one chassis.

14. Amplifier: Another way of saying that a tube amplifier. The professional audio system configuration needs to be configured by a professional to design a special sound system engineering solution according to the different requirements of different occasions. Let's take a look at the general solution for conference system engineering.

In addition, the requirements and solutions for professional audio in different locations are different. Professional audio equipment has high requirements for users, and has a good understanding of the functions and uses of various equipments. It has professional theoretical knowledge, accurate listening ability, strong debugging level, and emphasizes fault diagnosis and elimination. A well-designed professional audio system should not only focus on the design and commissioning of electroacoustic systems, but should take into account the actual sound propagation environment and perform precise on-site tuning. Therefore, the difficulty lies in the design and commissioning of the system. . More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.

Note: This article was transferred from China Audio Network. The article is an independent view of the author and does not represent the position of the home theater network.