The unique 805 D3 is the only speaker of its size to feature the Diamond dome tweeter, isolated in its own solid-body tweeter assembly for precise imaging and clarity. Technical features Diamond tweeter Continuum™ cone bass mid Anti-resonance plug Flowport™ Optimized Matrix Solid body tweeter Tweeter-on-Top Description 2-way vented-box system Drive units 1x ø25mm (1 in) Diamond dome high-frequency 1x ø165mm (6.5 in) Continuum™ cone bass midrange Frequency range 34Hz to 35kHz Frequency response (+/-3dB from reference axis) 42Hz to 28kHz Sensitivity (1m on axis at 2.83Vrms) 88dB Harmonic distortion 2nd and 3rd harmonics (90dB, 1m on axis) <1 % 70Hz - 20kHz <0.6% 120Hz - 20kHz Nominal impedance (min) 8? (minimum 4.6?) Recommended amplifier power 50W - 120W into 8? on unclipped programme Max. recommended cable impedance 0.1?