For the ultimate in performance and simplicity, a pair of PSRX725 speakers, and a single, high-power amplifier delivers superb high-level music and powerful bass Light-weight and very high-power. Dual 380 mm (15 inch) Differential Driver® low-frequency drivers for extended low-frequency output. 75 mm (3 in) voice-coil compression driver for high-power capacity and very lightweight. 75°x 50° coverage. Bi-amplified or full-range passive operation.