Knowles Special Transducers

Hundreds of design possibilities can be applied to your product challenge with our high-performance microphone designs.
Ideal for new product ideas that require premium audio and very small form factors, solutions include noise canceling, omni-directional and unidirectional performance.
Other variables include size, shape, amplification, sensitivity, low noise, and resistance to vibration and mechanical shock.
Knowles ST components and assemblies are unique in fit, form and function.

Knowles Specialty Transducer microphones are designed into high value applications in markets such as the following:

• • Sensor
  • Radio communication
  • Pro audio
  • Outdoor
  • Medical and more

Knowles Specialty Transducer microphones include:

• • Subminiature performance microphones (GA, FG, DFG, EM, EK, EL and NR Series)
  • Magnetic microphones(BJ Serie)
  • Piezo Ceramic microphones (BL Serie)
  • and Waterproof/Submersible subminiature microphones (WPand MR Series)

Knowles' magnetic microphones (BJ serie) are based on balanced armature technology and are self-shielded against external magnetic fields. The microphones offer high efficiency, stability, and reliability and are small in size.

The piezo ceramic microphones (BL serie) are rugged, stable, and versatile.
This serie features high vibration sensitivity & high resistance to mechanical shock. They may be used as accelerometers.

Knowles' waterproof/submersible subminiature microphones are designed to survive complete immersion in water:

• • WP serie can be immersed in water to a depth of 1 meter
  • MR serie can be immersed in water to a depth of 15 meters
    
    

Serie	Picture	Microphone type	Dimensions (mm)	Directivity	Comments
GA		Subminiature	2.00 x 2.00 x 4.00	Omni
FG/DFG		Subminiature	Ø2.56 x 2.56	Omni (FG) Uni (DFG)	Low noise, high shock resistance. DFG is improved FK with enhanced PFA performance
EM		Subminiature	3.63 x 3.63 x 2.28	Omni	EM is EK reduced package size with comparable benefits
WP		Waterproof subminiature	3.99 x 5.56 x 2.21	Omni Noise canceling	WP is a waterproof EK. Immersion up to 1m depth
EK/EL		Subminiature	4.00 x 5.59 x 2.28	Omni (EL) Uni (EL)	EK offers highest SNR and dyn. Range
NR		Subminiature Noise canceling	4.00 x 5.59 x 2.28	Noise canceling	NR is a noise cancelling EK. Stable directional pattern through 10kHz
BJ		Magnetic	7.87 x 5.59 x 4.01	Omni, Noise canceling
BL		Piezo Ceramic	7.87 x 5.54 x 4.06 7.87 x 5.54 x 2.24	Omni
MR		Waterproof /Submersible subminiature	Ø22.12 x 7.6 Ø22.12 x 9.3 Ø22.12 x 11.43	Omni	MR models integrate BJ and WP. Immersion up to 15m depth

To best choose the Specialty Transducer microphone for your application, please do not hesitate to contact us. Our team will be pleased to support you.