Bowers & Wilkins 603 speaker brings pristine sound to your home. Featuring Continuum™ cone technology, developed for our award-winning 800 Series Diamond, it creates a pure soundscape. Developed over an eight-year period and first featured on our flagship 800 Series Diamond models, the Continuum cone has been integrated into the sixth generation of the critically acclaimed 603. Fill your home with beautiful Bowers & Wilkins sound. Features Decoupled Double Dome aluminum tweeter Continuum™ cone FST™ midrange Paper bass cones Flowport™ Description 3-way vented-box system Drive Units 1x ø25mm (1 in) aluminum dome high-frequency 1x ø150mm (6 in) Continuum™ cone FST™ midrange 2x ø165mm (6.5 in) Paper bass Frequency range -6dB at 29Hz and 33kHz Frequency response 48Hz - 28kHz ±3dB Sensitivity 88.5dB spl (2.83V, 1m) Harmonic distortion 2nd and 3rd harmonics (90dB, 1m) <1% 90Hz - 22kHz <0.5% 120Hz - 20kH Nominal impedance 8? (minimum 3.0?) Crossover frequencies 400Hz, 4kHz Recommended amplifier power 30W - 200W into 8? on unclipped program