Acoustic performance indicators

1. Environmental noise status of the fully anechoic chamber:

The normal ambient noise around the fully anechoic chamber is around 60dB (ABC).

2. Indoor background noise value: When the outdoor ambient noise is ≤ 60DB (ABC) and there is no abnormal interference around (such as hitting the ground, piling, impact), the indoor background noise is ≤ 16DB (A)

3. Sound insulation index of the fully anechoic chamber: It is required to ensure that the background noise of the fully anechoic chamber is ≤ 16dB (A), and the sound insulation Lp of the walls, ceilings, doors, exhaust and other enclosure structures of the fully anechoic chamber is ≥ 44 dB (A),

4. Cut off frequency of the sound-absorbing cone in the fully anechoic chamber: Fo ≤ 100Hz