Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Diamonds key to a sparkling listening experience

21.02.2005


Music lovers could be in for the ultimate listening experience, thanks to a new range of speakers containing parts made of diamond, writes Marina Murphy in the Chemistry & Industry magazine. The unique properties of diamond make the speakers less susceptible to distortion and thus provide a clearer sound, say their manufacturers Bowers & Wilkins (B&W), UK.



The 800 Series speakers contain diamond ‘tweeter domes’ – the parts responsible for producing high-frequency sound. The domes are tiny components that move backwards and forwards in the speaker. The compressed air that results creates a pressure wave, which in turn produces sound.

Because diamond is rigid and very strong, the sound waves pass through the domes very quickly. But some tweeter domes made of traditional materials such as aluminium are susceptible to distortion at high frequencies.


For example, aluminium tweeter domes break up at a frequency of around 30 kHz, whereas the diamond tweeter domes are stable up to 70 kHz.

“The unique properties of diamond mean that we can create tweeter domes that are stiff, light and remain rigid throughout the audible frequency and beyond,” said Dr Gary Geaves, Head of Research at B&W.

Although other companies have produced diamond speaker parts, B&W’s are unique in that their diamond domes are skirted. This ‘skirt’ – a cylindrical section at the end of the dome – adds further rigidity, making the speakers even less susceptible to distortion.

The diamond is grown synthetically directly from methane and hydrogen gas using a carefully-regulated process called chemical vapour deposition (CVD), which involves heating the gases to very high temperatures (2000-3000oC) in a chamber, so that their carbon–hydrogen bonds break down to produce a carbon plasma that can grow a dome-shaped substrate in the chamber.

To produce a diamond using CVD takes a few days. It is a low cost process that will allow B&W to produce their speakers in large volumes. The CVD process was developed by the company Element Six, UK.

Jacqueline Ali | alfa
Further information:
http://www.chemind.org
http://www.soci.org

More articles from Life Sciences:

nachricht How brains surrender to sleep
23.06.2017 | IMP - Forschungsinstitut für Molekulare Pathologie GmbH

nachricht A new technique isolates neuronal activity during memory consolidation
22.06.2017 | Spanish National Research Council (CSIC)

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Quantum thermometer or optical refrigerator?

23.06.2017 | Physics and Astronomy

A 100-year-old physics problem has been solved at EPFL

23.06.2017 | Physics and Astronomy

Equipping form with function

23.06.2017 | Information Technology

VideoLinks
B2B-VideoLinks
More VideoLinks >>>