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Knowles ST microphones - BJ Series (7.87x5.59x4.01 mm)

BJKnowles’ Magnetic Microphones (BJ Series) 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 diaphragm of the BJ Series responds to pressure differential, giving high rejection of background noise. Both face and edge ports are offered. In addition, there is a short distance between front and back ports resulting in improved noise rejection up to higher frequencies.

    • Balanced armature technology
    • High efficiency, stability and reliability
    • Self-shielded against external magnetic fields
    • Face and edge ports
    • Diaphragm responds to pressure differential giving high rejection of background noise
    • Short distance between front and back ports resulting in improved noise rejection up to higher frequencies
 Model Picture Directivity Nominal Impedance at 1kHz (Ω) Nominal DC Résistance at 20°C (Ω)
BJ-21590-000 BJ-21590-000 Omni-Directional 3900 900
BJ-28411-000 BJ-28411-000 Noise Canceling 300 75.5
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