Thin-ply Carbon Diaphragms

Application examples and use cases

Use case

Ex Machina Soundworks midrange cone

"The demands on this 130 mm midrange cone deployed in our flagship 180 mm coaxial drive unit are daunting.

The cone must be stiff and light enough to provide high sensitivity so as to minimize thermal build up and power compression, while pushing any trace of distortion product from the first break up mode well outside of our in-use bandpass.

For a diaphragm this large, this is no easy to task to begin with, but it must also achieve this while optimizing the geometry not for stiffness, but for loading characteristics, as the diaphragm forms the waveguide for our concentric tweeter. It must furthermore achieve this while also exhibiting an exactly optimal proportion of circumferential to radial stiffness, to ensure the diaphragm does not beam before it reaches our crossover.

And finally, when breakup does ultimately occur in the diaphragm, it must be tightly controlled.

Only Composite Sound could meet all these requirements."

– Dev Avidon, CEO Ex Machina Soundworks

Use Case

Custom Install Tweeter

"Our client desired a specific geometry to meet certain design criteria for a tweeter to be used in a custom install application. When reviewing the customer requirements and simulating the acoustic performance in Comsol, we found that only three options met the requirements: Beryllium, Diamond and Composite Sound’s TPCD. Besides the cost advantage of the Composite Sound TPCD, it also enabled optimized characteristics of the tweeter. After evaluating a number of Composite Sound tweeter diaphragm constructions, we chose the one best matching our requirements on sensitivity, break up frequency and controlled behavior."

– Frank Nielsen, Danesian Audio

Use Case

Compression Driver

"It was a total Eureka moment when we saw the stiffness to weight ratios, speed of sound and acoustical figure of merit those values [TPCD material properties] equate to.

I’ll never forget experiencing that material for the first time. The 5” square of material was unlike anything I’ve ever seen. It was light as a feather with the rigidity of a steel beam. The sound it made from flicking the edge was completely unique. Best way to describe it, it was the sound of something you didn’t think was possible. We made some reeds and began testing, comparing to our titanium material. Not only did we confirm that the bending mode frequency significantly increased, but that’s when we realized the incredible internal damping this material possessed as well. The decay of the material upon removal of the stimulus was on par with what I had seen with Berylliums response to stimulus. It was incredible."

– Matt Marcum, Senior Design Engineer Eminence Speaker

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