Figure 9.

L₃ for 3 dB of suppression as a function of L₂ (dB SL) for on-frequency (closed squares) and low-frequency (open squares) suppressors. The low-frequency suppressor was approximately 1 octave below f₂. Top and bottom rows show results for simple and multiple linear regressions, respectively. Left and right columns show data for f₂=500 Hz and f₂=4000 Hz, respectively. The lines represent linear fits to each set of data. Slopes of these lines are provided as insets adjacent to the line to which they apply.