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At the centre of it all
The centre-channel speaker is arguably the most important in home theatre – and the HTM81 D4 has an enviable array of advanced technologies to reinforce that point, including Solid Body tweeter-on-top, a decoupled Continuum™ Cone midrange drive unit and twin 200mm (8in) Aerofoil™ bass cones.

Aerofoil bass cone
Our 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, we have added the foam Anti-Resonance Plug for lower distortion and even cleaner bass.

Diamond dome tweeter
One of our most significant accomplishments over the past two decades, the ultra-stiff, supremely accurate Diamond dome tweeter is the perfect combination of low mass, exceptional stiffness and outstanding accuracy. 15 years after we introduced it, we haven’t found a better tweeter dome technology.

Aluminium bass pods
HTM81 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.

Technical features

  • Diamond tweeter
  • Solid body Tweeter-on-Top
  • Continuum cone FST
  • Anti-Resonance plug
  • Biomimetic Suspension
  • Matrix
  • Aerofoil cone bass units
  • Flowport

Description
3-way vented-box system

Drive units
1x ø25mm (1in) diamond dome high-frequency
1x ø150mm (6in) Continuum cone FST midrange
2x ø200mm (8in) Aerofoil cone bass units

Frequency range
20Hz to 35kHz

Frequency response
28Hz 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
8ohms (minimum 3.0ohms)

Recommended amplifier power
50W – 500W into 8ohms on unclipped programme

Max. recommended cable impedance
0.1ohms

Dimensions
Height: 334mm
Width: 847mm
Depth: 371mm

Net weight
32.20kg

Cabinet finishes
Gloss Black
White

Grille finishes
Black
Grey