The Alón Exotica Grand Reference System: This system provides state-of-the-art acoustic performance and delivers a sound that is closer than ever to a live experience. In addition, it offers expanded performance in the areas of clarity, wide-band dynamics, frequency range, high frequency transient reproduction, musicality and soundstage reproduction. The system, consisting of five main pieces, is comprised of the following: Two Main Towers w/ external tri-wired passive crossover Two Passive Subwoofer Towers One Variable Low Pass Filter (Electronic)