Table 2 Basic parameters of the sound insulation test chamber.

From: Frequency domain characterisation of the sound insulation performance of wooden doors and optimal design of high performance wooden doors

Reverberation chamber-anechoic chamber dual-chamber method

Volume

Type of diffuser

Wall materials

Microphone specifications

Reverberation chamber

6 m×5 m×3 m(90 m³)

The type of diffuser is a stainless-steel rotating diffuser (diameter 1.5 m, rotational speed 1–5 rpm).

Outer layer: Double-layer concrete (thickness = 200 mm, surface density = 400 kg/m²)

Inner layer: ceramic tiles/galvanized steel plate (reflectivity = 99%@500 Hz)

Type: 1/2-inch condenser microphone

Accuracy: complies with IEC 61,672 class 1

Quantity: 1, evenly distributed in space

Anechoic chamber

6 m×5 m×3 m(90 m³)

Glass fiber wedge(noise reduction coefficient27 = 0.99, Length = 1.2 m)

10 mm steel plate and aluminum alloy frame

B&K 4190(Frequency range: 3.15 Hz–20 kHz)

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