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Variable venting valve for earmolds.

W A Cooper, J R Franks, R N McFall

    Audiology : Official Organ of the International Society of Audiology
    |May 1, 1975
    PubMed
    Summary
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    Variable venting valves (VVV) in earmolds primarily affect low frequencies, offering minimal loudness reduction in speech ranges. Side-branch vented earmolds proved more effective, but overall VVV utility for geriatric hearing aid users is questionable.

    Area of Science:

    • Audiology
    • Hearing Aid Technology

    Background:

    • Earmolds are crucial components of hearing aids, influencing sound delivery.
    • Variable venting valves (VVV) offer adjustable acoustic properties, but their effectiveness requires detailed investigation.

    Purpose of the Study:

    • To evaluate the frequency response and loudness reduction characteristics of earmolds with variable venting valves (VVV).
    • To compare the efficacy of side-branch versus laterally vented earmolds with VVV.
    • To determine the optimal opening stage of VVV for acoustic modification.

    Main Methods:

    • Sound pressure measurements were taken across 44 frequencies (100-4000 Hz) using a modified HA-2 coupler.
    • VVV were tested at four opening stages: closed, 1/3 open, 2/3 open, and fully open (3/3).
    • Both side-branch and laterally vented earmolds were analyzed.

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    Main Results:

    • Venting effects were most pronounced at low frequencies.
    • Minimal intensity reduction was observed in the speech frequency range (500-2000 Hz).
    • Side-branch vented earmolds demonstrated greater effectiveness than laterally vented designs.

    Conclusions:

    • The primary acoustic benefits of VVV are realized within the initial 1/3 of valve opening.
    • Further opening of the VVV yields diminishing returns in frequency response and loudness reduction.
    • The practical utility of VVV, particularly for geriatric hearing aid users, remains uncertain.