How to choose conference room audio
Ⅰ.Core Requirements for Conference Room Audio
1. Sound Pressure Level and Coverage
Conference room audio systems must ensure clear sound throughout the entire room. According to International Electrotechnical Commission (IEC) standards, the recommended sound pressure level for small and medium-sized conference rooms (20-50 square meters) is 75-85dB, while for large conference rooms (50-100 square meters), it should reach 85-95dB. If remote conferencing is required, an additional 10% power margin is required to offset network transmission losses.
2. Frequency Response and Speech Clarity
The voice band (200Hz-4kHz) requires special optimization, with a recommended frequency response range of 80Hz-16kHz (for full-range speakers). Avoid excessive bass that results in muddiness, and insufficient high frequencies that affect detail. According to "GB/T 4959-2011 Method for Measuring Sound Reinforcement Characteristics in Halls," the STI value for speech intelligibility should be ≥ 0.6.
3. Anti-howling Ability
Use speakers with strong directional characteristics (such as cardioid polar patterns) and a feedback suppressor. The distance between the microphone and the speaker should be greater than 1.5 meters to prevent acoustic feedback.
II. How to Choose the Right Conference Room Audio System
1. Match Equipment to the Room Size
① Under 20 m2: Choose 2-4 30W wall-mount speakers with a coverage angle of ≥ 90°.
② 20-50 m2: Choose 4-6 50W ceiling speakers or 2 100W main speakers + auxiliary fill speakers.
③ Over 50 m2: Linear array speakers with a power of ≥ 200W per speaker, paired with a digital mixing console, are recommended.
2. Functional Requirements
①Basic Conferencing: An omnidirectional microphone and a simple mixer are sufficient.
② Multimedia Conferencing: Requires support for HDMI/Bluetooth input and an extended frequency response of 20Hz-20kHz.
③ Remote Conferencing: Must include acoustic echo cancellation (AEC) technology and latency ≤ 50ms.
3. Installation and Commissioning Key Points
①The recommended speaker height is 2-2.5 meters, with a 10-15° tilt angle toward the audience area.
②Use an acoustic tester (such as REW software) to calibrate the frequency response curve, keeping the error within ±3dB.