APK 165 Ω2 system features 2 crossovers dedicated to woofer and tweeter and separated, to ease the installation. APCX WF Ω2 crossover shapes AP 6.5 Ω2’s frequency response to match it optimally with AP 1 tweeter; it also employs a Low ESR inductor, essential to maximize the power transfer to the 2Ω coil. APCX TW Ω2 tweeter crossover, instead, is provided with the Hi-Contour function, to enhance the high frequencies, designed to achieve the correct timbre balance with rich low frequencies guaranteed by the woofer.