HTM81 D4 - Side - Black HTM81 D4 - Side - White
HTM81 D4 - Grille - White
HTM81 D4 - Front - Black HTM81 D4 - Front - White
HTM81 D4 - Back - Black HTM81 D4 - Back - White

HTM81 D4

Centre-channel speaker

Our largest centre-channel speaker is designed to partner the 801 D4 and 802 D4. A powerful performer, it has both the scale and the midrange extension to perfectly match the quality of its illustrious stablemates.

 

* Stand not included.

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Downloads:

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Manual
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Info Sheet
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Brochure
 

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.

 

Discover More

 

800 Series Diamond

Introducing the world’s most advanced loudspeaker range

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Technical specifications

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
8Ω (minimum 3.0Ω)

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

Max. recommended cable impedance
0.1Ω

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

Net weight
32.20kg

Finishes
Cabinet:
Gloss Black
White

Grille:
Black
Grey

 

HTM81 d4 - black