Acoustic Design Scheme for Multi-functional Lecture Hall

In modern society, multi-functional lecture halls have become important venues for various activities and occasions, including academic lectures, concerts, authoritative speeches, business meetings, and colorful social events. However, these venues are usually accompanied by complex acoustic challenges, such as issues with sound reflection, absorption, and propagation. The existence of these problems may significantly affect the audience's auditory experience and the speakers' performance, thereby reducing the effectiveness of the events. For this reason, acoustic treatment has become increasingly important in the design and operation of multi-functional lecture halls. This article will use the case of a multi-functional lecture hall to introduce how to properly carry out sound insulation decoration for a lecture hall.

Part 1. Project Overview and Core Requirements

A 396-square-meter multi-functional lecture hall with a floor height of 3.5 meters needs to accommodate functions such as meetings, performances, and film and television screenings. The core design goals are: eliminating defects like flutter echoes and sound focusing, creating a mid-frequency reverberation (500-1000Hz) of 0.9s±10%, achieving a speech intelligibility of ≥0.75, increasing music fullness by more than 20%, while meeting the requirements of environmental protection and fire resistance (Class A1) and no dust pollution.

Part 2.Earppie Acoustics Sound Insulation Solution

2.1 Ceiling structure: Dual-effect design of shock absorption + sound absorption

Breaking through the traditional gypsum board flat ceiling, the combination of "Earppie light steel keel + ceiling shock absorber + 50mm polyester fiber sound-absorbing cotton" is adopted. The shock absorber cuts off the sound bridge through a spring-rubber composite structure, reducing the low-frequency vibration transmission efficiency by 70%. It is matched with 6D high-density polyester fiber board (1220×2420×9mm), whose sound absorption coefficient of 0.85 (at 500Hz) effectively broadens the sound absorption frequency band. The stepped shape design, combined with a 20° beveled reflection surface, evenly diffuses the sound energy to the rear seats, with the measured sound field unevenness being less than 3dB.

2.2 Wall Sound Insulation Solution: Modular Sound Absorption + Dynamic Damping

For a 380㎡ wall surface, the combination plan of "Earppie three-layer composite soundproof door sticker + 50mm self-adhesive soundproof cotton" is adopted:

• Base layer: Fully paste 1.2mm damping sound insulation felt to suppress wall vibration (STC≥28)

• Middle layer: staggered pasting of self-adhesive sound insulation cotton (50×50×5cm). The high-density foam structure absorbs full-frequency noise from 125-4000Hz, and the self-adhesive design enables quick construction of 10㎡ per 30 minutes.

• Surface layer: Earppie wooden sound-absorbing panels with a customized perforation rate of 12.5% (133×2440×15mm), featuring A1-class fire-resistant base material and 100% corduroy finish, which balances acoustic performance and decorative aesthetics.

• Data verification: The noise reduction of the combined structure reaches 35dB, which is 15% higher than that of the traditional scheme.

2.3 Window and door system: gap sealing + structural upgrade

For an 8㎡ glass curtain wall, the combination of "Earppie 10mm sound insulation sealing strip + double-layer insulating glass" is adopted:

• Window frame: Embedded with high-density sound insulation cotton sealing strips (30mm wide × 5m long), which block 90% of sound leakage through gaps and also have windproof and dustproof functions

• Glass: Upgraded to 5+12A+5 laminated glass, combined with Earppie sound-insulating door stickers (STC≥35), the measured external traffic noise is attenuated to below 38dB

• User case: After the renovation of a certain KTV, the leakage of 90dB music in the private rooms was reduced to 55dB, which meets the Class 2 standard of GB3096-2008.

2.4 Pipes and Ground: Refined Treatment of Concealed Works

Air conditioning ducts: wrapped with Earppie closed-cell rubber and plastic insulation cotton (Class B1 fire resistance). When the pipe diameter is >300mm, damping sheets are added to reduce airflow noise by 15dB.

Fire pipelines: Adopt the double-layer wrapping of "damping sheet + aluminum foil sound insulation cotton" (refer to JD user construction cases), with reinforced fixation at the elbows, increasing the impact sound insulation rate by 40%

Ground: A 5mm Earppie rubber sound insulation mat is laid under the floating structure, combined with 20mm sound-absorbing cotton, reducing footstep noise to 45dB (in accordance with the ISO 140-8 standard)

Part 3.Verification of Earppie Materials' Performance Advantages

Summary

This solution achieves the engineering value of "environmental protection + efficiency + long-term effectiveness" while ensuring that acoustic indicators meet the standards through the systematic application of Yipai's sound insulation cotton, shock absorbers, sealing strips and other products. From the ceiling to the ground, and from the walls to the pipelines, each node incorporates Yipai's 20 years of experience in acoustic research and development, providing a solution with both professional performance and practical feasibility for multi-functional spaces.