
AcoustiPack™ LITE PC Soundproofing Kit (APL)
These soundproofing materials have been designed to achieve maximum acoustic attenuation over a broad frequency range:
    * High Transmission Loss
      High transmission loss is the composite material s ability to impede
      airborne noise.
    * High Noise Reduction Coefficients
      High noise reduction coefficients is the composite material s ability to
      absorb airborne sound energy with minimal reflections.
    * Damping
      Damping is the composite material s ability to attenuate structure-borne
      vibration on metals and other substrates thereby reducing reradiated
      noise.
AcoustiPack LITE 2-Layer Materials
AcoustiPack™ LITE contains 2-layer acoustic materials. Comparative small and 
large scale acoustic tests with alternative single-layer PC sound-proofing 
materials demonstrate that AcoustiPack™ multi-layer materials are more effective 
and safer, whilst still remaining as thin as possible.
       
The upper layer, immediately opposite the noise source, is a layer of semi-open 
cell dense acoustic foam which provides a low-reflection surface. This upper 
layer of foam provides some sound attenuation, especially of higher-frequency 
sound (>1kHz). The very dense black limp  plastic  layer at the base 
of the 2-layer material is directly attached to the substrate. This layer acts 
as both an acoustic barrier (effectively attenuating the transmission of sound 
energy through the material) and as a damping layer, reducing vibration in the 
substrate (usually a thin steel panel in many PCs and server enclosures).
The 2-layer materials in the AcoustiPack™ range of kits are 4mm thick. Acousti 
Products manufacture thickness greater than 4mm for OEM and manufacturers, but 
the thickness in the AcoustiPack™ kits is the thinnest we can produce to 
facilitate fitting the materials in small and narrow spaces inside modern PC 
cases.