Fluid Audio FA-C5 Powered Studio Monitors (2- Speakers) Frequency response: 54 Hz - 22 kHz / Crossover frequency: 4.5 kHz / Amplifier power: 2 x 20 watts (40W total) Signal-to-noise: &get; 90 dB (typical A-weighted) Polarity: Positive signal at + input produces outward LF one displacement Input impedance: 20 k ohms balanced, 10 k ohms unbalanced Power: Fixed 110V ~50/60 Hz or 220V~50/60 Hz