Over-the-Counter Hearing Aids: A Lost Decade for Change

<div>Electroacoustic measurements conducted on OTC hearing aids. OSPL 90: maximum sound pressure level output; HFA FOG; high frequency average full-on gain; EIN: equivalent input noise; THD: total harmonic distortion; I/O: input/output.</div>

BioMed Research International

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Figure 2

Figure 2: Over-the-Counter Hearing Aids: A Lost Decade for Change 