Example power spectral density (dB re 1 µPa² Hz^-1) of acoustic conditions within the experimental area (sampling rate: 25.6 kHz; FFT size 8192 [3 Hz bin width], overlap 91.5%, von Hann Window, frequency range 50-5000 Hz) for (<i>a</i>) baseline ambient noise conditions (bottom grey line) with masking broadband noise (120–3000 Hz) conditions (top black line); and (<i>b</i>) 170 Hz tonal stimuli; and (<i>c</i>) insonified experimental area showing the dimensionless signal-to-noise ratio (SNR [dB]) in the1/3^rd octave band at 13.5 cm depth.

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