Flat speakers get smaller

June 2, 2005
The second generation of distributed-mode actuators, the electromechanical components in flat speakers for portable devices, are now 20% smaller and up to 10 times more efficient than traditional magnet-and-coil designs.

The new DMAs from NXT plc, Huntingdon, U.K. (www.nxtsound.com/general/home.php), measure 22 7 3.5 mm and rely on piezoelectric polycrystalline ceramics. Applying a voltage changes the ceramic actuator, which generates sound when the actuator is connected to an acoustic lens. In a portable phone, for example, the DMA, which contains two ceramic actuators, attaches to the display screen, which vibrates to create sound. DMAs are typically 1.5-mm thick, weigh about 2 gm, and cost less than $2.00.

Sponsored Recommendations

April 16, 2025
Clean. Compact. Less heat.
April 16, 2025
SEW-EURODRIVE Introduces DR2C motor, IE5 Ultra-Premium Efficiency Motor
March 31, 2025
Unlike passive products - made of simple carbon springs - the bionic prostheses developed by Revival Bionics are propulsive, equipped with a motor and an artificial Achilles tendon...
March 31, 2025
Electric drives are a key technology for the performance of machines, robots, and power tools. Download this guide for an introduction to high-quality mechatronic drive systems...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!