玻璃棉毡、吸音棉毡作吸音材料使用时，在其背后留着空气层或表面粘贴装饰材料。在空气层厚度为100-150mm范围内，空气层越厚，中、低音域的吸音率越高，如空气加厚到300mm，有效吸音率范围就扩大100Hz。
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