Frequency response at -6dB Half Space : 45Hz - 30kHz Sensitivity Half Space: 93dB SPL/2.83V/1m Power Handling: 90Wrms, 200W peak Recommended Amplifier power: From 20W to 200W per Channel Maximum SPL (continuous): 109dB SPL Nominal Impedance: 8 Ohms Minimal Impedance: 5.8 Ohms Dimensions: H330mm (12.99in) x W230mm (9.06in) x D275mm (10.83in) Weight: 17kg / 37.4Lbs each Woofer: One 16.51 cm (6.5in) High-strength cellulose fiber cone impregnated and coated on both sides with damped resins Tweeter: One 2.54cm (1in) Fabric dome Front Bass Reflex design Air core inductors Polypropylene capacitors Metal film resistors Special finitions on demand : 30 different anodized colours, polished aluminium, customized surface.