What is an LBT sound reinforcement system?

LBT sound reinforcement system, also known as professional sound system

There is a misconception in society that the sound reinforcement system is very simple, as long as the microphone (and other sound sources), mixing console, amplifier, and speaker box are connected together to form a sound reinforcement project. This understanding has caused many homeowners to invest a lot of money, but the resulting language amplification effect is blurry and the feedback of howling interference makes the sound unable to be amplified, and the sound quality changes and tones during music playback are tasteless to listen to.

Furthermore, a sound reinforcement system is usually a system that amplifies the speaker's voice in real-time to the listener, and the speaker and listener are usually in the same acoustic environment. A successful sound reinforcement system must have sufficient loudness (sufficient sound gain) and sufficient fidelity (low percentage loss of speech sub tone fidelity), and be able to evenly cover the audience without covering areas without an audience.

The sound reinforcement system includes sound reinforcement equipment and sound field components, mainly including the sound source and its surrounding sound environment, microphones that convert sound into electrical signals, equipment and transmission lines that amplify signals and process signals, speakers that convert signals into sound signals, and the acoustic environment of the audience area.

Classification - Work Classification

1. Sound reinforcement system: The microphone and speaker are in the same sound field, and there is a condition of sound feedback self-excitation, which limits the sound transmission gain.

2. Sound amplification system: It is a special case of sound amplification system, with only sound sources such as card holders and CD players, and no sound feedback conditions.

Classification - Usage classification

1. Outdoor sound reinforcement system: sports venues, art squares, music fountains, large-scale mobile performances, etc.

2. Indoor sound reinforcement system: various types of cinemas, sports arenas, and dance halls.

3. Mobile performance system: commonly used for large-scale performances and temporary installation systems.

4. Public Broadcasting System (PA): broadcasting programs and background music at stations, airports, subways, ports, schools, and hotels, and also serving as a fire emergency broadcast.

5. Conference system: Conference center, telephone conference, video conference, and digital conference system.

Design of sound reinforcement system

The design of sound reinforcement systems usually starts with sound field design and gradually progresses backwards to power amplifiers, sound processing, mixing consoles, and sound sources. Because sound field design is the foundation for meeting the system's functional requirements and sound effects. Therefore, this backward design step is very necessary.

Sound supply scheme for indoor sound reinforcement system

1. Centralized sound supply (point source sound supply)

Advantages: It can effectively reduce interference between sound sources, with excellent sound quality, consistent audio-visual direction, natural listening experience, and even sound field.

Disadvantages: The sound energy loss is significant, making it unsuitable for low space and narrow rooms. The hanging height of the speakers in the centralized sound supply system should not be less than 8-10m, otherwise the sound field is not easy to be uniform.

2. Distributed sound supply

Suitable for narrow rooms, rooms with lower heights, rooms with longer reverberation times, or tunnel sound reinforcement systems.

Advantages: The sound field is uniform and the loss of sound energy is minimal.

Disadvantages: Inconsistent audio-visual experience, significant interference between sound sources, especially poor sound quality in overlapping areas covered by two sound sources