Bowers & Wilkins 803 D4 Floor Stand Speakers...

...notably more compact than the 801 D4 or 802 D4 yet bristling with shared 800 series technical innovation, most obviously in the use of a three-box construction.
Its Tweeter-on-Top, 130mm (5in) midrange cone in Turbine Head are carefully isolated from the impact of its bass drivers mounted in the Reverse Wrap enclosure.

Reverse Wrap cabinet...

Instead of a conventional loudspeaker box, our cabinets are made from a continuous curved section of wood, with the drive units mounted at the heart of the curvature. This stiffer, more inert structure resists mechanical resonances far better and also ensures better dispersion of sound.

Bowers & Wilkins - 804 D4 - Printable Information Sheet

B&W 803 D4 Specifics:

• 1x 25mm (1in) Diamond Dome high-frequency, Solid Body Tweeter-on-Top housing
• 1x 130mm (5in) Continuum cone FST midrange, Biomimetic Suspension, Decoupled Turbine Head
• 2x 180mm (7in) Aerofoil Profile bass cones with Anti-Resonance Plug
• 3-way vented-box system with Flowport and Matrix
• Frequency range: 16Hz to 35kHz
• Frequency response: 19Hz - 28kHz (+/- 3dB from reference axis)
• Sensitivity: 90dB spl (on axis at 2.83V at 1m)
• Harmonic distortion: 2nd and 3rd harmonics (90dB, 1m)
  <1% 80Hz - 20kHz
  <0.3% 100Hz - 20kHz
• Nominal impedance:8ohms (minimum 3ohms)
• Recommended amplifier power: 50W - 500W into 8ohms on unclipped programme

Dimensions
Height: 1165mm
Width: 357mm
Depth: 511mm

Net weight
62.15 kg

Cabinet finishes
Gloss Black + Black Grille
Satin Rosenut + Black Grille
Satin Walnut + Grey Grille
White + Grey Grille