Attenuation and delay equalizers

THE ADJUSTABLE loss characteristics obtained in the A and B equalizers are shown by the curves of Figure 1. These curves show the maximum adjustment range above and below a reference loss which is approximately 40 decibels in each equalizer. Pairs of curves are identified by a number corresponding to the line-up frequency in kilocycles. The loss can be adjusted continuously or in small steps to fall on curves intermediate to those shown. All intermediate curves are approximately proportional to the limiting cases shown.