Impedance 4 ΩFrequency response 40 - 150Sensitivity 101 dBMaximum power input 150 WWoofer material IMPP composite cone woofer with Strontium magnetStrontium Magnet YesBuilt-in amplifier YesBuilt-in variable LPF (50-125 Hz, -12dB/oct.) YesDimensions 250 x 265 x 110 mmWoofer Size 20 cm