Dual 15" speaker systems have become one of the most popular configurations with DJs and musicians who are looking for more low-frequency performance while maintaining the simplicity of a single-box system. The JRX125 is actually a "quasi three-way" design. This means that the upper woofer covers lows and mids. The bottom woofer uses a lower crossover frequency and covers only lows, acting as a built-in subwoofer. So you get the extra low-end of a dual 15" rig while maintaining the superior mid-frequency performance of a single driver system. Specifications Frequency Range (-10 dB): 36 Hz - 16 kHz Frequency Response (?3 dB): 45 Hz - 12 kHz Sensitivity (1w/1m): 100 dB SPL Nominal Impedance: 4 ohms * Power Capacity: 500 watts * Peak Power Capacity: 2000 watts Recommended Amplifier Power: 500 watts to 1000 watts into 4 ohms Maximum SPL: 133 dB Nominal Dispersion: 90? x 50? Crossover Frequency: 2 kHz Dimensions (H x W x D): 1099 mm x 464 mm x 432 mm (43.25 in x 18.25 in x 17 in) Weight: 42.6 kg (94 lbs) High Frequency Driver: JBL 2412 1" exit compression driver mounted on Progressive Transition?Waveguide Low Frequency Driver: JBL M115-8A x 2 Input Connectors: Neutrik? Speakon? NL-4 (x1), ?" TS phone jack (x1), parallel