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. 2021 Sep 1;3:724539. doi: 10.3389/fdgth.2021.724539

Figure 2.

Figure 2

The equal-level contour plots of IMD3 as a function of (L1, L2). The thick line marks LIMD3=0 dB SPL, and other lines are in 4-dB steps. The IMD3 level were obtained by varying L1 from 30 to 70 dB SPL and L2 from 20 to 64 dB SPL in 2 dB steps. For each combination of (L1, L2), the stimulus lasted for 1.0 s with a 2.5-ms raised cosine ramp for the rising and falling edges. The stimulation was repeated five times and the average IMD3 level is shown. The solid line and the dashed line represent L1 = L2 and L1 = L2 + 10 (dB), respectively.