Requisite Audio SR71 Silk Dome Monitors (Pair) SPECIAL FEATURES CROSSOVER OPTIONS: The SR71 is available with passive, active analog (see: SRC2/SRC3) or active digital (see: HPD-3S) crossover options. The electronic analog and digital crossovers offer a path to system expansion from a simple two-way format to a three-way or even four-way system. The digital HDP-3 [...]