Front of 803 D4 speaker close up top

803 D4

Floor-standing speaker
803 D4 - White side front view
803 D4 - White side front covered woofers view
803 D4 - White front view
803 D4 - White back view

803 D4

Flagship 800 Series Diamond floor-standing speakers

Our most compact headed model brings all the technical advantages of a dedicated midrange enclosure – the Turbine™ Head, with its decoupled midrange cone – to a smaller footprint that’s easily accommodated in any home.

  • Diamond Tweeter
  • Solid body Tweeter-on-Top
  • Continuum™ Cone FST
  • Anti-Resonance Plug
  • Biomimetic Suspension
  • Turbine™ Head
  • Matrix™
  • Aerofoil™ Cone Bass Units
  • Flowport™
Choose a finish
Gloss Black Satin Rosenut Satin Walnut White
White
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803 D4

803 D4

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2 803 D4 speakers in living room lifestyle

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 (5-in) midrange cone is carefully isolated from the impact of its bass cones thanks to its Turbine Head enclosure.
Interior build of speaker

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.

Interior shell of speaker
Aluminum shell of speaker

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.

Discover more
Factory building speaker
Light Walnut 803 D4 front with beige background - Step up for more power

Step up for more power

803 D4 features all the most iconic ingredients in the 800 Series Diamond range including, of course, that famous headed enclosure. It is, however, smaller than its other siblings. Step up to the 802 D4, and you’ll get both larger 200mm (8-in) bass cones and a larger 150mm (6-in) midrange driver.
Discover 802 D4

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Setting new standards of performance

  • Performance
  • Tweeters
  • Midrange
  • Bass
  • Enclosure Design
This Model
803 D4 - White side front view
803 D4
Flagship 800 Series Diamond floor-standing speakers
  • Performance: Reference
  • Tweeters: 1 x 25mm (1 in) Diamond dome high-frequency
  • Midrange: 1 x 130mm (5 in) Continuum cone FST midrange
  • Bass: 2 x 180mm (7 in) Aerofoil cone bass
  • Enclosure Design: 3-way vented-box system
801 D4 - Black side front view
801 D4
Flagship 800 Series Diamond floor-standing speakers
  • Performance: Reference
  • Tweeters: 1 x 25mm (1 in) Diamond dome high-frequency
  • Midrange: 1 x 150mm (6 in) Continuum cone FST midrange
  • Bass: 2 x 250mm (10in) Aerofoil cone bass
  • Enclosure Design: 3-way vented-box system
802 D4 - Black side front view
802 D4
Flagship 800 Series Diamond floor-standing speakers
  • Performance: Reference
  • Tweeters: 1 x 25mm (1 in) Diamond dome high-frequency
  • Midrange: 1 x 150mm (6 in) Continuum cone FST midrange
  • Bass: 2 x 200mm (8 in) Aerofoil cone bass
  • Enclosure Design: 3-way vented-box system
804 D4 - Black side front view
804 D4
Flagship 800 Series Diamond floor-standing speakers
  • Performance: Reference
  • Tweeters: 1 x 25mm (1 in) Diamond dome high-frequency
  • Midrange: 1 x 130mm (5 in) Continuum cone FST midrange
  • Bass: 2 x 165mm (6.5 in) Aerofoil cone bass
  • Enclosure Design: 3-way vented-box system
803 D4
Details & Specifications
  • Net weight 62.15kg (137 lb)
  • Dimensions Height: 1165mm (45.9 in)
    Width: 357mm (14.1 in)
    Depth: 511mm (20.1 in)
  • Technical features Diamond tweeter
    Solid body Tweeter-on-Top
    Continuum™ cone FST
    Matrix™
    Anti-Resonance plug
    Biomimetic Suspension
    Turbine™ Head
    Aerofoil™ cone bass units
    Flowport
  • Description 3-way vented-box system
  • Drive units 1x ø25mm (1in) Diamond dome high-frequency
    1x ø130mm (5in) Continuum cone FST midrange
    2x ø180mm (7in) Aerofoil cone bass units
  • Frequency range 16Hz to 35kHz
  • Frequency response 19Hz to 28kHz (+/-3dB from reference axis)
  • Sensitivity 90dB (on axis at 2.83Vrms at 1m)
  • Harmonic distortion 2nd and 3rd harmonics (90dB, 1m on axis)
    <1% 80Hz – 20kHz
    <0.3% 100Hz – 20kHz
  • Nominal impedance 8Ω (minimum 3.0Ω)
  • Recommended amplifier power 50W – 500W into 8Ω on unclipped programme
  • Max recommended cable impedance 0.1Ω
  • Cabinet finishes Gloss Black
    White
    Satin Rosenut
    Satin Walnut
  • Grille finishes Black
    Grey
    Black
    Grey