Figure 4.4. This graph has the vertical scale marked off from -15 dB at the bottom to 15 dB at the top. The frequency scale is from 10 Hz to 100 kHz. Only the bass part of the curves are showing because the treble control has been left at center of rotation (flat) for the entire test. At 10 Hz the values of max cut, half cut, flat, half boost, and max boost, are as follows. -14.5, -6.2, 0, 6.2, 14.5 dB. The upper and lower curves converge toward the flat curve gradually at first then more quickly and more slowly again as they get close to the flat curve. All 5 curves merge into one at 1 Khz. At 1.8 kHz they separate slightly with the green curve on the high side and the purple curve on the low side. The separation isn't much, about the width of one of the lines. This is the reverse interaction that is discussed in the text. The lines merge together again at 6 kHz.
Figure 4.5. The graph has the vertical scale marked off from -24 to 24 dB. The frequency is from 10 to 100k Hz. From 10 Hz to 490 Hz the 5 curves appear as one at zero db. The 5 lines begin to separate at 490 Hz and just a little past 1 kHz 5 lines are discernable. By 2 kHz it is clear that the half cut and half boost lines are closer to their respective max cut and boost lines than to the flat line. At 10 kHz the half lines are half way between their respective max and flat lines. Above that they become closer to the flat line than to the max lines. At 100 khz the 5 lines have the following values. Starting with max cut and ending with max boost they are. -24, -6, 0, 6, and 24 dB. End verbal description.
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