Pro System Selector Black 2.0 Satellite Speaker Maximum Recommended Amplifier Power - 100 Watts Satellite Speaker Impedance - 8 Ohms nominal Satellite Speaker Sensitivity - 88dB at 1 Watt/1 meter Satellite Speaker Frequency Response - 100Hz - 20kHz Satellite Speaker Tweeter - One 1/2-inch (13mm) titanium-laminate dome, video-shielded