Frequency response: 38Hz - 21kHz ±3dB on reference axis Sensitivity: 91dB spl (2.83V, 1m) Nominal impedance: 8 Ohms Recommended amplifier power: 5W - 200W on unclipped program within frequency domain Metric: System: 248 mm round x 86 mm deep Cut-out: 219 mm round x 86 mm deep Net weight: 2.3 kg each