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Knowles Acoustics has introduced the TWFK series, a small dual-balanced armature receiver with mechanical shock resistance and extreme wideband capability, designed for pro-audio, in-ear applications.

The company said the strength of balanced armature (BA) receivers is their efficiency compared with dynamic speakers.

This allows the design of in-ear monitors (IEM) with multiple drivers of different characteristics, which allow the customisation of the frequency response.

In addition, the small sound port of such receivers allows the use of filters and tubing of different dimensions.

Customised crossover circuits as well as ventilation configurations add up to a good set of tuning tools for the IEM designer, Knowles Acoustics said.

The following provides a small insight into the above tools based on the TWFK as an example.

The TWFK receiver combines a tweeter and a woofer in a single output.

Different acoustic Knowles dampers are used for attenuating high-frequency peaks.

The value, but also the position of the damper in the tube, has influence on the response shape.

As crossover, a simple capacitor is used for the TWFK that controls the transition between the elements in the frequency response.

The designer can use a different capacitor value to modify the response in an earphone.

Design support on the above aspects, as well as further information, can be accessed via Knowles Acoustics experts at Europe Info.

Knowles Acoustics

Knowles Corporation (NYSE: KN) is a market leader and global supplier of advanced micro-acoustic solutions and specialty components serving the mobile communications, consumer electronics, medical technology, military, aerospace and industrial markets. Knowles has a leading position in micro-electro-mechanical systems microphones, speakers and receivers which are used in smartphones, tablets and mobile handsets. Knowles is also a leading manufacturer of transducers used in hearing aids and other medical devices and has a strong position in oscillators (timing devices) and capacitor components which enable various types of communication. Knowles' focus on the customer, combined with unique technology, rigorous testing and global scale, helps to deliver innovative solutions and consistently dependable and precise products. Founded in 1946 and headquartered in Itasca, Illinois, Knowles has more than 10,000 employees in 36 locations around the world.

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