With the advancement of society, government agencies, enterprises, and institutions, as well as hotels, increasingly require multi-functional and conference halls to host a variety of events such as operas, music performances, film screenings, and meetings. These spaces must be designed with excellent acoustic properties to ensure clear sound transmission and optimal listening experiences.
To achieve this, it's not only about installing high-quality audio equipment but also implementing proper acoustic design. This ensures that the environment supports both speech clarity and musical performance. In 2001, the Ministry of Construction and the Ministry of Culture issued the "Architectural Design Specification (JGJ57-2000)" to emphasize the importance of integrating acoustic design throughout the entire architectural and interior design process.
The specification defines key acoustic parameters for auditoriums, particularly the reverberation time (T60), which is crucial for determining how sound behaves in a space. The T60 values vary 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
These values apply to auditoriums with volumes ranging from 2000 to 10,000 cubic meters. The formula used to calculate T60 is:
**T60 = 0.161V / [−S ln(1−α) + 4mV]**
Where:
- V is the room volume (in m³),
- S is the total internal surface area (in m²),
- α is the average sound absorption coefficient,
- m is the air sound attenuation coefficient (per meter).
The average sound absorption coefficient (α) can be calculated as:
**α = (∑Siαi + ∑Njαj) / S**
Where:
- Si is the surface area of each part of the room,
- αi is the absorption coefficient of that surface,
- Nj is the number of people or objects,
- αj is the absorption coefficient associated with them.
From this, it's clear that adjusting the reverberation time requires careful selection of materials with high absorption coefficients, especially at low and mid-frequencies. Since room volume and surface area are typically fixed during construction, the focus is on choosing the right materials.
If materials have low absorption coefficients, more of them are needed, increasing costs. Alternatively, selecting seats with higher absorption can reduce material usage and lower overall investment. Using Qinyi sound-absorbing panels is an efficient solution, as they provide excellent absorption across low, medium, and high frequencies, allowing for fewer panels or less costly seating options while still achieving superior acoustics.
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