Frequency response of the Passive insertable tone control circuit. There are two graphs and only one difference between them. The upper one is described first. The vertical axis is marked of in dB from minus 40 to 0. Curve 2, the center, tone flat, line runs across the graph from 10 cycles to 100 kc at minus 20 db. At 100 kc it has fallen to minus 21 dB. The top curve starts at minus 1 dB and has fallen to minus 2 dB at 50 cycles. It is down to minus 20 dB at 1 kc and rises again to minus 8 dB at 10 kc. It is at minus 6 dB at 20 kc and continues falling only slightly at 100 kc. Curve 2 starts out at minus 11 dB and is at minus 15 dB at 50 cycles. It hits the minus 20 line at 150 cycles and actually drops below the line a little. It continues in a tangle of lines until breaking out of the pack at about 1200 cycles. It is at minus 16 dB at 10 kc. The fourth line starts at minus 28 db and is at minus 27 dB at 50 cycles. It joins the tangle of lines at about 220 cycles and breaks out at about 1200 cycles. It is at minus 25 dB at 10 kc. Line 5 begins slightly off the graph a little below minus 40 dB. It appears at 25 cycles and at 50 cycles is at minus 38 dB. It joins the tangle at 700 cycles and breaks away at 1300 cycles. At 10 kc it is at minus 31 db, at 20 kc at minus 39, and at 30 kc it is minus 40. It continues across ending at 100 kc at minus 41 dB. The only difference between the first and second graphs is the behavior of curve 5 above 5 kc. The curve in both graphs is at minus 27 dB at 5 kc. At 10 kc in the second graph line 5 is at minus 31.5, at 20 kc it is at minus 37 db and it falls off the graph at about 29 kc. End verbal description.
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