How to measure the insulation effect of a soundproof meeting pod?

Construction of soundproof meeting pod
Soundproof cabins typically adopt multi-layer composite structures, including:
Outer layer: High density materials (such as steel plates, aluminum alloys) or soundproof glass, used to block external noise.
Intermediate layer: sound-absorbing materials (such as polyester fiber sound-absorbing panels, rock wool) and air isolation layer, which absorb sound energy and reduce vibration transmission.
Inner layer: porous sound-absorbing materials (such as foam plastic and glass fiber) to reduce internal echo.
Sealing design: Magnetic suction sealing doors, soundproof doors and windows, and sealing strips to prevent sound leakage.
Common soundproof materials
Sound absorbing materials: polyester fiber cotton, rock wool, glass fiber, used for walls and ceilings.
Soundproofing board: Soundproofing gypsum board, aluminum honeycomb board, used for wall structures.
Damping material: Butyl rubber, reduces structural vibration.
Size selection of soundproof conference cabin
Small (1 person): The external dimensions are approximately 100 × 100 × 230cm, and the internal dimensions are 84 × 84 × 194cm.
Medium size (2 people): external 180 × 150 × 220cm, internal 161 × 131 × 202cm.
Large (4 people): external 210 × 160 × 220cm, internal 191 × 141 × 202cm.
How to measure the sound insulation effect of a conference room?
Use professional instruments: measure decibel values using a sound level meter, or evaluate the sound insulation performance of walls using a sound insulation tester.
Manual testing: Two people cooperate, one person speaks in the room and the other person listens to the difference in sound volume in adjacent areas.
Reference standard: According to the "Code for Sound Insulation Design of Civil Buildings", the allowable noise level in the conference room should be ≤ 45dB (A).
Mobile APP assistance: such as decibel meter APP, although the accuracy is limited, it can quickly estimate.