KRK R6G3 ROKIT 6 G3 6" 2-Way Passive Studio Monitor, Black Tweeter: 1" Neodymium Soft Dome Tweeter with Ferro Fluid Drivers: 6" Glass Aramid Composite Woofer Impedance: 8 Ohms Sensitivity: 87 dB @ 1M/1W Frequency Response:4 9 Hz - 20 kHz, +/-2 dB