Bowers and Wilkins HTM81 Diamond D4 Centre Speaker

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The Bowers and Wilkins HTM81 Diamond D4 Centre Speaker provides a true reference level performance for your home cinema system, with the most advanced technologies of speaker design, to deliver an astonishing performance.

The Aerofoil bass cone technology remains an outstanding solution to the conundrum of combining low mass and high stiffness in bass cones, thanks to its carbon-fibre skin and variable-profile foam core. Now, foam Anti-Resonance Plugs have been added for lower distortion and even cleaner bass.

The newest Solid Body Tweeter-on-Top housing features an elongated form with a longer tube-loading system, producing an even freer and open sound with high frequencies. The carefully decoupled housing is milled from a single solid block of aluminium to better resist resonance.

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 HTM81 D4 is the best yet, upgraded with extensive aluminium bracing to reinforce key stress points.

Instead of a conventional loudspeaker box, the cabinet in HTM81 D4 is 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.

Sometimes, making a big difference takes unconventional thinking. The new Biomimetic Suspension revolutionises midrange performance by greatly reducing the unwanted air pressure and colouration that a traditional fabric spider can generate, resulting in midrange transparency you wouldn't believe.

The HTM81 Diamond D4 is in the new 800 Series Diamond range, featuring a no-compromise design that includes all the most advanced technologies in their purest, most optimised form alongside crossover components of the highest quality for reference-level sound.

Bowers and Wilkins HTM81 Diamond D4 Centre Speaker features

  • 3-way dedicated centre speaker
  • 2x 8 inch aerofoil cone bass drivers
  • 6 inch Continuum cone FST midrange driver
  • 1 inch diamond dome tweeter
  • Solid body tweeter on top design with decoupled housing
  • Matrix bracing reduces cabinet resonance
  • Biometric suspension minimises air pressure and colouration for clear midrange
More Information
BrandsBowers and Wilkins
Product Specifications


3-way vented-box system

Drive units

1x ø25mm (1in) diamond dome high-frequency

1x ø130mm (6.5in) Continuum cone FST midrange

2x ø200mm (8in) Aerofoil cone bass units

Frequency range

20Hz to 35kHz


90dB (on axis at 2.83Vrms at 1m)

Recommended amplifier power

50W – 500W into 8O on unclipped programme


334 x 847 x 371mm



Your Delivery:

Orders received before 1:00 pm* will be despatched the same day and can be delivered for next working day, (except bank holidays).  For you convenience you can choose multiple shipping options on the checkout page. We will also email with your tracking and dispatch information.

30 Day Returns Policy

HiFix is committed to selling quality products which we hope you will love, we do understand, however, that there maybe a time when you need to exchange or return something you have bought. We really do hope you are pleased with your purchase but should you wish to return anything bought from us, we will be happy to refund or exchange a product within 30 days.

NameSKUQtyLead time
Bowers and Wilkins HTM81 Diamond D4 Centre Speaker Piano Black507380Warehouse stock usually available in 2 to 3 working days.
Bowers and Wilkins HTM81 Diamond D4 Centre Speaker Piano White507430Warehouse stock usually available in 2 to 3 working days.

Warranty information for Bowers and Wilkins:

Bowers & Wilkins products are designed and manufactured to the highest quality standards. However, if something does go wrong with the product we are here to help. From your date of purchase your product is warranted against faulty materials or workmanship for a period of 60 Months all Passive Speakers, 24 Months Subwoofer Systems, 24 Months all Headphones, 24 Months all Multi media and 12 months on Stands and Accessories.

This guarantee applies to all Bowers & Wilkins Products including 5.1 Speaker Systems, AirPlay & wireless speakers, Bookcase Speakers, Centre Speakers, Floor Standing Speakers, Computer Multimedia Speakers, Hi Fi Headphones, In Ceiling and Inwall Speakers, OutDoor All Weather Speakers, Rear Surround Speakers, Sound Bars and Sub Woofer Systems. Providing you with peace of mind and the assurance of premium quality.

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