M-Audio BX8 D2 Next Generation 130-Watt Bi-Amplified Studio Monitors Bi-amplified design with 130 watts of distributed power for cohesive, accurate sound 8-inch low-frequency drivers with Kevlar cones for rich, defined lows 1-1/4-inch high-frequency drivers with natural silk domes and integrated waveguides for smooth, clear highs Optimized rear ports for extended low-frequency response XLR balanced and 1/4" balanced/unbalanced inputs to connect all your gear