The S4700 is a floorstanding 3-way high-performance loudspeaker built upon the same professional-grade technology used in the acclaimed Project K2 S9900, one of the most advanced and sophisticated loudspeakers in the world today. At its foundation, the S4700 uses a cast-frame 15-inch (380mm) woofer, a 1.75-inch (45mm) titanium compression driver and a 0.75-inch (20mm) titanium compression driver for lifelike dynamics and startling realism.