Small wonder

803 D4 may be notably more compact than the 801 D4 or 802 D4, but it still bristles with technical innovation, most obviously in its use of a three-box construction. Its 130mm (5in) midrange cone is carefully isolated from the impact of its bass cones thanks to its Turbine Head 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.

Enhanced Matrix™

Matrix bracing uses interlocking panels to reinforce loudspeaker cabinet walls in all directions internally, reducing resonance and creating a more believable soundstage. The Matrix assembly in 803 D4 is our best yet, ensuring optimum scale, power and intelligibility.

Aluminium bass pods

803 D4 mounts two Aerofoil™ bass cones in twin solid aluminium bass pods, each of which is clamped into an aluminium plate fixed to the stiffest part of its curved cabinet. Formed as single pieces of metal, these stiff structures provide the perfect mechanical location for those powerful bass cones.

The science of sound

Innovation is at the heart of everything we do. We question, we examine, we understand and then we evolve. We use computer modelling to explore and reimagine every aspect of loudspeaker design. Learn more about all the technologies that combine to make 800 Series Diamond™ so special here.

Specifications

Size & Weight

• Net Weight: 62.15 kg (137 lb)
• Dimensions (Height x Width x Depth):
  • Height: 1165 mm (45.9 in)
  • Width: 357 mm (14.1 in)
  • Depth: 511 mm (20.1 in)

Technical Features

• Diamond Tweeter: Provides exceptional clarity in high frequencies.
• Solid Body Tweeter-on-Top: Optimizes high-frequency reproduction and soundstage precision.
• Continuum™ Cone FST™ Midrange: Delivers natural and accurate midrange frequencies.
• Matrix™: Internal bracing to reduce cabinet resonance and improve rigidity.
• Anti-Resonance Plug: Minimizes unwanted vibrations.
• Biomimetic Suspension: Ensures stable diaphragm movement for accurate sound.
• Turbine™ Head: Improves midrange clarity by reducing cabinet resonances.
• Aerofoil™ Cone Bass Units: High-performance bass drivers designed for deeper, more accurate bass.
• Flowport: Reduces turbulence in the port for cleaner bass.

Description

• Type: 3-way vented-box system.

Drive Units

• High-Frequency Driver: 1 x ø25mm (1in) Diamond Dome Tweeter.
• Midrange Driver: 1 x ø130mm (5in) Continuum™ cone FST™ midrange.
• Bass Drivers: 2 x ø180mm (7in) Aerofoil™ cone bass units.

Frequency Response

• Frequency Range: 16Hz to 35kHz.
• Frequency Response: 19Hz to 28kHz (+/-3dB from reference axis).
• Nominal Impedance: 8Ω (minimum 3.0Ω).
• Sensitivity: 90dB (on-axis at 2.83Vrms at 1m).

Performance

• Harmonic Distortion:
  • <1% 80Hz – 20kHz.
  • <0.3% 100Hz – 20kHz.
• Recommended Amplifier Power: 50W – 500W into 8Ω on unclipped programme.
• Max Recommended Cable Impedance: 0.1Ω.

Finishes

• Cabinet Finishes:
  • Gloss Black.
  • White.
  • Satin Rosenut.
  • Satin Walnut.
• Grille Finishes:
  • Black.
  • Grey.