With the advancement of society, government agencies, enterprises, institutions, and hotels increasingly require multi-functional halls and conference rooms to host a variety of events such as operas, musical performances, dance shows, film screenings, and conferences. These spaces must ensure excellent acoustic performance to enhance the audience's experience. While high-quality sound equipment is essential, proper acoustic design plays an equally important role in creating a favorable auditory environment.
To guarantee the acoustic quality of these spaces, the Ministry of Construction and the Ministry of Culture issued the "Architectural Design Specification" (JGJ57-2000) in February 2001. This document emphasized the need for architectural acoustic design to be integrated throughout the entire building and interior design process. One of the key acoustic parameters defined in the specification is the reverberation time T60, which varies depending on frequency:
- 125Hz: 1.10–1.68 seconds
- 250Hz: 1.10–1.54 seconds
- 500Hz: 1.10–1.40 seconds
- 1000Hz: 1.10–1.40 seconds
- 2000Hz: 0.99–1.40 seconds
- 4000Hz: 0.88–1.40 seconds
Note: These values apply to auditoriums with volumes ranging from 2000 to 10,000 cubic meters.
The formula used to calculate the reverberation time T60 is:
**T60 = 0.161V / [ -S ln(1 - α) + 4mV ]**
Where:
- **V** is the room volume in cubic meters,
- **S** is the total internal surface area in square meters,
- **α** is the average sound absorption coefficient,
- **m** is the air sound attenuation coefficient (per meter),
- **Si** is the surface area of each section,
- **αi** is the sound absorption coefficient for that surface,
- **Nj** is the number of people or objects,
- **αj** is the sound absorption coefficient for those elements.
From this formula, it’s clear that adjusting the reverberation time to meet the required standards primarily depends on selecting materials with high sound absorption coefficients, especially in low and mid-frequency ranges. Since the room volume and surface area are usually fixed during the design phase, the choice of acoustical materials becomes critical.
If the material has a low absorption coefficient, a larger quantity may be needed, or seats with higher absorption properties might be required, which can significantly increase the project cost. However, using Qinyi sound-absorbing panels offers a more efficient solution. These panels have high absorption coefficients across a wide range of frequencies, including low, medium, and high, allowing for fewer panels to be used or the option to choose seats with lower absorption coefficients without compromising acoustic quality. This leads to better acoustics while keeping the overall investment manageable.
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