1,600-watt High-definition 2-way Loudspeaker, Active, with 15" Woofer, 3" Voice Coil, 1.75" Compression Driver, Patented Acoustic-correction, and Birch Cabinet (each). For incredible power and clarity, trust Mackie's HD1521 2-way high-definition loudspeaker. In designing the HD1521, Mackie applied their time-proven principles of amplification toward a true high-definition design. To achieve this, Mackie added their patented acoustic correction processing along with transducer time-alignment and phase-correction technology, to develop an extremely accurate loudspeaker. With 1,600 watts of efficient Class-D "Fast Recovery" amplification, an adjustable 3-band EQ, and limiting circuitry, the Mackie HD1521 is ready to deliver pro-level sound.