Hifonics BRX1400.1D Brutus Vehicle Mono Subwoofer Amplifier Molded and angled ILLUMINATED Terminals for stress free installation access Accu-Cross crossovers and adjustments for sound shaping Ultra-Fi MOSFETS NGSD Next Generation Super D-Class for extremely efficient system 1 x 550 @ 4 Ohms, 1 x 900 @ 2 Ohms, 1 x 1400 @ 1 Ohm