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Signal and noise spectra (in 1/3 octave bands) in unaided and aided conditions as measured in a B&K Ear Simulator positioned in the sound field. Overall signal levels at 1000 Hz are approximately equivalent in unaided and aided conditions. In contrast, background noise in the 1000 Hz octave band is very different in the unaided and aided conditions as a result of circuit noise produced at the four gain settings.
