Fluid Audio F5 (Pair) - 5" 2-way Studio Reference Monitors, White Frequency response: 49 Hz - 22 kHz Polarity: Positive signal at + input produces outward LF one displacement Input impedance: 20 k ohms balanced, 10 k ohms unbalanced Input sensitivity: 85 mV pink noise input produces 90dBA output SPL @ one meter with volume control at maximum (101dB Max SPL) Power: 115V ~50/60 Hz or 230V~50/60 Hz user switchable Protection: RF interference, output current limiting, over temperature, turn-on/off transient, subsonic filter, external mains fuse