BioMed Research International / 2015 / Article / Fig 2

Research Article

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

Figure 2

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.