Figure 6.5. In this graph the treble is being stepped while the bass control stays at center. The curves have exactly the same values they did in figure 6.2. As the frequency comes down from 100 kHz they all come together at about 1200 Hz. But at 1 kHz they spread apart slightly in the opposite direction. That is the green line is at the top while the purple line as at the bottom. At its maximum the separation is less than 1 dB. They come back together at 100 Hz. End verbal description.
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