ATC\u2019s programme of research and development has generated many loudspeaker technologies \u2013 from small details to major innovations. Constrained Layer Damping (CLD) is a driver cone technology from ATC that represents another advance in driver performance – one that transfers directly to system performance and the reproduction of music.<\/p>\n
A fundamental trade-off in the properties of a driver cone is mechanical stiffness versus mechanical damping. High stiffness tends to produce a cone with extended axial frequency response but with poor off-axis response and multiple high Q resonances. High mechanical damping however, while improving a cone\u2019s resonant behaviour, tends to increase moving mass reducing efficiency. CLD is a new approach to cone damping that brings the advantages of high damping with a smaller mass increase.<\/p>\n
Conventional cone damping techniques involve the application of damping compounds directly to one or both side of a semi-rigid cone. With CLD, two lightweight cones sandwich a constrained damping layer. Constrained layer damping is effective because, as the cone flexes, the damping material is forced into a shape that shears adjacent material sections. The alternating shear strain dissipates the vibration energy as low grade frictional heat.<\/p>\n
The enhanced damping performance of CLD can bring significant improvements to bass\/mid drivers incorporating the technique. Three areas of driver performance benefit:<\/p>\n
\u2022Harmonic Distortion: The harmonic distortion is typically reduced between 300Hz and 3kHz compared to a conventionally constructed cone.<\/p>\n
\u2022Axial Frequency Response: The resonance free frequency response can extend a further octave higher so easing constraints on cross-over filter frequencies and slopes.<\/p>\n
\u2022Off-axis Response: Thanks to its effective damping the dispersion performance of a CLD cone approximates to that of a smaller driver as its effective radiating area gradually reduces with frequency.<\/p>\n","protected":false},"excerpt":{"rendered":"
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