Noise reduction. Through technology

Case Studies




Aero Engine Manufacturing Facility

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Testimonials


This is the best turntable mat I’ve yet heard.  I’ve tried it on a wide variety of decks (budget, high end, belt drive and direct) and every time I’ve wanted to keep it on rather than reverting back to stock. At well under £100, it’s a bargain.
The whole soundstage opens out (front to back, left to right), the tonality of the instruments is better discernible, the bass appears tighter and more fluid and the treble smoother and cleaner. Even with a turntable with excellent disc support such as a Michell GyroDec, the SDS mat makes an obvious difference.
The full HIFI world is reproduced in the case studies section.

Constrained Layer Damping

SDS polymers are designed to damp resonance & vibration....
the result of exciting a natural frequency of a system (striking a tuning fork, for example). In automotive applications, energy is typically input continually to produce a forced vibration. Without some way of dissipating the energy of the interaction, noise and vibration will be continually generated.
That's where Sound Dead Steel comes in. Its viscoelastic properties absorb noise-producing energy by converting shear strain to negligible heat. The higher the strain, which is transferred to the polymer, the higher the energy dissipation.
Shear strain is generated by sandwiching a thin layer of viscoelastic polymer between a vibrating surface and a stiff constraining layer of metal. This holds one surface of the polymer in check while the other extends and compresses.

Another key is to keep the polymer layer extremely thin. SDS polymers range from 50 to 100 microns.
  • Unconstrained layer damping where a layer of bitumastic (or similar) high damping material is stuck to the surface

  • Constrained layer damping where a laminate is constructed


    diagram of damping layers

The following link from a government web site gives further information on Constrained Layer Damping (CLD) and other noise issues