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AcoustiPack EXTRA: Sheet 3 Layer Professional Sound Dampening (APExtS)
Part #: noi-17
Orderable, Stock Expected 1-18 Days  
Price: $22.99
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Product Description   Features   Specifications   Reviews (4)    
The new range of AcoustiPack sound-proofing kits has been designed with our customer's pockets and greater flexibility in mind! As a result, we have introduced AcoustiPack EXTRA Sheet (7mm), which is a single large sheet of our latest generation 3-layer acoustic material (as found in ULTIMATE). This sheet is ideal if additional materials are required for a particular project, and the space allows for a 7mm sheet to be added. This product makes our range of acoustic material kits more flexible, and can help to save money and waste when an entire kit, such as ULTIMATE or LITE is not necessary.

Perhaps best suited where there is enough room to fit a sheet of acoustic materials that is 7mm thick. Best fitted directly opposite a noise source, such as adjacent to the CPU fan on the inside of the case side door panel, or on the floor directly below a noisy HDD cage.

3 Layer Materials

In our latest generation of 3-layer composite (Patent Pending), the dense acoustic barrier layer has been 'suspended' away from the substrate in the center of the acoustic foam. The construction layering is like this: (noise source) acoustic foam -> acoustic barrier -> acoustic foam (then the substrate, which is usually a metal sheet panel).
Sound energy first hits the upper foam surface, which is similar to the 2-layer construction, in that it is a low-reflective soundproofing material that is particularly effective at absorbing high frequencies. The sound energy then encounters the central suspended barrier layer, which is decoupled from the substrate. This high-density high-mass layer acts as an acoustic barrier mass to the transmission of energy through the material. The 3rd layer of foam acts to suspend the barrier layer a small distance away from the substrate. We have found from both small scale impedance tube and larger scale reverberation chamber acoustic tests that the 'suspended' central acoustic barrier effectively increases the absorption of low frequency noise (<1 kHz). This may well be a result of the 'mass-spring effect', where low frequency energy is absorbed by the sound 'moving' the layer when it is excited by certain resonant frequencies.
The 3-layer materials are attached by a supported self-adhesive directly to the substrate, and have a damping effect on panel vibrations. (Hit the side of your PC once fitted, and you will hear a dull 'thud' sound).
The 3-layer materials in the AcoustiPack kit range are 7mm thick. We also manufacture these composites up to 13mm thickness (and over if required) for manufactures and OEMs. For example, they have been very successfully used in servers and server cabinets, and tested by many different organizations all over the world since they were first developed.

Note: Please take care to read the installation recommendations before installing this product. These materials are installed at the owners ow risk.

Fitting recommendations are supplied in the User Instructions with the pack, and are available for download here: AcoustiPack™ User Instructions (90Kb)!

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