CHAPTER 14 Crossovers (a) (b) dB dB Hz (c) (d) Hz dB dB Hz Hz FIGURE 14.20 Target functions--practical realization: (a) Desired target function; (b) Measured driver response; (c) Electrical filter response-- allows for a non-flat driver response; (d) System response as measured--equal to (a), i.e., it achieves its target. latter case can avoid the use of large value capacitors, and can therefore employ smaller value compo- nents of much greater long-term stability. This is an important concern when we need to produce very precise response curves. Active circuitry can also eliminate the need for lossy, and potentially non- linear, inductors.