EF-21937-000

Speakers Overview

The Knowles EF-21937-000 is a balanced armature receiver speaker designed for audio applications. It features a top port configuration and operates with an impedance of 641 Ohms. The device delivers a sensitivity of 126 dB SPL at 1 kHz, measured at 1 volt. Its frequency response spans from 200 Hz to 6.3 kHz, covering mid-range audio requirements. The physical dimensions are 7.87 mm in length, 5.59 mm in width, and 4.01 mm in height.

Speakers Feature Summary

• Utilizes balanced armature technology for high-fidelity sound reproduction
• Features a top port design for optimized acoustic output direction
• Provides high sensitivity for efficient audio performance

Speakers Applications

• Mid-range audio systems
• Hearing aid devices
• Specialty transducers

Speakers Procurement Notes

Verify the specific part number EF-21937-000 against official Knowles documentation to confirm technical specifications. Ensure compatibility with intended acoustic housing designs due to the fixed top port orientation. Check for RoHS compliance status as indicated in current distributor listings. Confirm package dimensions match system constraints before finalizing procurement orders.

Speakers Selection Notes

Select this component when a compact receiver with high sensitivity is required for mid-frequency audio tasks. The 641 Ohm impedance may necessitate specific driver circuitry considerations compared to standard low-impedance speakers. Evaluate the 200 Hz to 6.3 kHz frequency range against target audio bandwidth requirements. Consider the physical footprint of 7.87 x 5.59 x 4.01 mm for space-constrained enclosures.

Speakers Part Context

Knowles is recognized as the originator of balanced armature technology, applying it across receivers, specialty transducers, and hearing aid products. This component belongs to their line of precision audio solutions, leveraging established expertise in micro-acoustic engineering for reliable performance in demanding electronic applications.

Speakers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult official Knowles documentation or authorized distributors for verified cross-reference information before considering alternative components.