Proel DIVASUB18A Active Subwoofer - 18"DIVASUB18A is a digitally processed active subwoofer designed as an ideal complement to the DIVA Series speakers, capable not only of increasing the extension of the low frequency response, but also of significantly increasing the efficiency and performance of the whole system. The subwoofer uses a custom 18" high efficiency woofer with 3" voice coil, driven by a powerful 1500 W CLASS D amplifier with high headroom and dynamic control via DSP, for