FEF-26790-I02

Speakers Overview

The Knowles FEF-26790-I02 is a round receiver speaker with an 88 Ohm impedance and a frequency range of 200 Hz to 4.5 kHz. It features a cloth cone and achieves a sound pressure level of 118.5 dBA at 4.5 kHz, with an efficiency rating of 109.50 dBA. The unit measures 66.30 mm in diameter, 7.87 mm in length, and 4.06 mm in depth.

Speakers Feature Summary

• Side port configuration for acoustic output
• Cloth cone material construction
• High sound pressure level capability

Speakers Applications

• Hearing aid devices
• Medical audio equipment
• Assistive listening systems

Speakers Procurement Notes

Verify the specific laser marking specification, as Knowles has updated this for the FEF-26790-I02 model. Confirm that the component matches the Ferrofluid design characteristics. Ensure the ordering suffix corresponds to the current production version to avoid discrepancies in physical markings or internal specifications.

Speakers Selection Notes

Select this component when high acoustic output is required within a compact form factor. The 88 Ohm impedance suits specific driver circuits. The side port design influences mounting orientation. Verify compatibility with hearing aid simulators such as the ANSI S3.7 type HA-3 setup for accurate performance testing.

Speakers Part Context

This part belongs to the Knowles NE series of receivers. It is designed for high-fidelity audio reproduction in small electronic devices. The product line emphasizes reliability and consistent acoustic performance for professional audio applications.

Speakers Replacement Considerations

Check for direct substitutes within the Knowles FEF or FED series. Verify impedance and dimensional compatibility before substitution. Consult official change notifications for any superseding part numbers.

Speakers FAQ

What is the self-resonant frequency?

Public datasheets do not explicitly list a self-resonant frequency value for this specific model.

Does the I02 suffix indicate a functional change?

The suffix typically denotes manufacturing revisions or marking updates rather than a change in core electrical function.