AcoustiPack™ ULTIMATE Professional Sound Dampening Pack (APU)

AcoustiPack™ ULTIMATE contains both 2- and 3-layered 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.

2 Layer Material

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, expecially 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. We manufacture thickness greater than 4mm for OEM and manufacturers, but the thickness in the AcoustiPack™ kits is the thinnest we can produce to facilitiate fitting the materials in small and narrow spaces inside modern PC cases.

3 Layer Material

In our latest generation of 3-layer composite (Patent Pending), the dense acoustic barrier layer has been 'suspended' away from the substrate in the centre 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 absorbtion of low frequency noise (<1kHz). 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 organisations 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)!

You may also like to consider adding AcoustiPack™ EXTRA Foam Blocks (APExtB) to this kit. This will increase the internal surface area of the acoustic materials, and help to absorb extra acoustic energy inside the PC or server case More Details or simply add to your order in the options below!

Product FAQs!

Offers the very highest level of noise reduction
Suitable for large PC & Server enclosures
Pack contains 3 large sheets of acoustic materials
2 sheets of 4mm (2-layer), and 1 sheet of 7mm (3-Layer)

High Transmission Loss

High transmission loss is the composite material’s ability to impede airborne noise.

Damping

Damping is the composite material’s ability to attenuate structure-borne vibration on metals and other substrates thereby reducing reradiated noise.

Material Non-Flammability

The individual components of the multi-layer composites used in AcoustiPack™ sound-proofing kits are certified and UL-listed for low flammabilty.
The finished 2- and 3-layer composites (including the adhesives) have also been tested using a vertical burning flame test, and both 4mm and 7mm materials meet class UL94-V0. The acoustic foam material supplied in AcoustiPack™ EXTRA is certified to UL94-HF1.
These low flammability results more than satisfy BS EN 60950-1:2002 ‘Information Technology Equipment - Safety’ section 4.7 with respect to resistance to fire for materials inside fire enclosures.