The flagship of the 800 Series Diamond range is a no-compromise design: behind that strong visual statement is half a century of design and engineering, all in the cause of greater musical insight and impact. Technical features Diamond tweeter Continuum™ Cone FST™ Anti-Resonance plug Turbine head Aerofoil™ cone bass units Flowport™ Optimized Matrix Solid body tweeter Tweeter-on-Top Description 3-way vented-box system Drive units 1x ø25mm (1 in) Diamond dome high-frequency 1x ø150mm (6 in) Continuum™ cone FST™ midrange 2x ø250mm (10 in) Aerofoil™ cone bass units Frequency range 14Hz to 35kHz Frequency response (+/-3dB from reference axis) 17Hz to 28kHz Sensitivity (1m on axis at 2.83Vrms) 90dB Harmonic distortion 2nd and 3rd harmonics (90dB, 1m on axis) <1% 80Hz - 20kHz <0.3% 100Hz - 20kHz Nominal impedance (min) 8? (minimum 3.0?) Recommended amplifier power 50W - 1000W into 8? on unclipped programme Max. recommended cable impedance 0.1?