Infinity Beta 40 Floorstanding Speakers - Cherry - Frequency Range: 40Hz - 40kHz (-6dB) Recommended Amplifier Power: 10 - 200 Watts Sensitivity (2,83 V @ 1m): 91dB Nominal Impedance: 8 Ohms Crossover Frequency: 600Hz,3.2kHz;24dB/octave Low-Frequency Driver: Dual 165mm (6-1/2") CMMD™, magnetically shielded and more Home HiFi Systems