What is more important for the effectiveness of noise attenuators?

For the effectiveness of noise attenuators, securing a good seal of the device is crucial because sound can leak through gaps and openings, significantly reducing the device's ability to block or absorb noise. A well-sealed device ensures that sound waves are effectively contained and mitigated, allowing the attenuator to perform at its best.

While the transmission properties of the material and the type of noise do play important roles in sound attenuation and should be considered, they do not outweigh the necessity of having a good seal. If the device is poorly sealed, even the best materials or designs cannot adequately prevent noise from escaping or penetrating. Cost is also a factor in the selection process but does not directly influence the effectiveness of the noise attenuation itself. Without a good seal, the effectiveness of any noise attenuator diminishes significantly, regardless of other characteristics.