BK-21706-000

Description：SPEAKER 500OHM TOP PORT 126DB
Series：BK
Mfr：Knowles
Package：Bulk

SKU:5e5a4306d70d Category: Speakers Brand: Knowles

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Product introduction

Product Detailed Parameters

Description：SPEAKER 500OHM TOP PORT 126DB
Series：BK
Mfr：Knowles
Package：Bulk
Type：Receiver, Balanced Armature
Technology：Magnetic
Impedance：500 Ohms
Power - Max：-
Shape：Rectangular
Termination：Solder Pads
Size / Dimension：0.310" L x 0.220" W (7.87mm x 5.59mm)
Height - Seated (Max)：0.310" (7.87mm)
Frequency - Self Resonant：-
Efficiency - dBA：126
Efficiency - Testing：-
Efficiency - Type：Sensitivity
Port Location：Top
Material - Cone：-
Material - Magnet：-
Ingress Protection：-
Ratings：-
Frequency Range：200 Hz ~ 4 kHz
Power - Rated：-

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BK-21706-000

Overview

The Knowles BK-21706-000 is a balanced armature receiver transducer designed for audio applications. It features a magnetic technology construction with an impedance of 500 Ohms and a sensitivity of 126 dBA. The device operates within a frequency range of 200 Hz to 4 kHz and has physical dimensions of approximately 7.87 mm in length, 5.59 mm in width, and 4.04 mm in depth.

Feature Summary

Balanced armature receiver design for high-fidelity audio reproduction
High sensitivity output of 126 dBA for efficient sound generation
Compact rectangular form factor suitable for space-constrained devices

Applications

Hearing aids
In-ear monitors
Wireless earbuds

Procurement Notes

Verify the specific port configuration (top or side) required for your assembly, as documentation indicates variations. Confirm that the 500 Ohm impedance matches your driver circuit requirements. Ensure the 126 dBA sensitivity aligns with your target acoustic performance standards before finalizing procurement.

Selection Notes

Select this component when a compact, high-sensitivity balanced armature is needed. The 500 Ohm impedance suits specific amplifier outputs. Consider the 4mm depth for tight enclosure constraints. Validate compatibility with existing acoustic tubes or waveguides due to the specific port orientation.

Part Context

This part belongs to Knowles' portfolio of precision audio transducers. Balanced armature receivers are standard in miniaturized hearing instruments and premium audio gear. The BK series focuses on delivering consistent electroacoustic performance in small packages.

Replacement Considerations

Direct substitutes require matching 500 Ohm impedance, 126 dBA sensitivity, and similar physical dimensions. Verify port location (top vs. side) to ensure mechanical fit. Cross-reference acoustic tuning requirements with alternative balanced armature models from other manufacturers.