Center-channel speaker

HTM81 D4

Center-channel speaker
HTM81-D4 in Silver
HTM81-D4 in Silver
HTM81-D4 in Silver
HTM81-D4 in Silver

HTM81 D4

Flagship 800 Series Diamond center 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(s) not included.

  • Diamond Tweeter
  • Solid body Tweeter-on-Top
  • Continuum™ Cone FST
  • Anti-Resonance Plug
  • Biomimetic Suspension
  • Matrix™
  • Aerofoil™ Cone Bass Units
  • Flowport™
Choose a finish
Gloss Black White
White
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HTM81 D4

HTM81 D4

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At the center of it all

At the center of it all

The center-channel speaker is arguably the most important in home theater – 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 (8-in) Aerofoil™ bass cones.
Aerofoil bass cone

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-fiber 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.

Diamond dome tweeter
Aluminum bass pods

Aluminum bass pods

HTM81 D4 mounts two Aerofoil bass cones in twin solid aluminum bass pods, each of which is clamped into an aluminum 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.

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The science of sound

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Setting new standards of performance

  • Performance
  • Tweeters
  • Midrange
  • Bass
  • Enclosure Design
This Model
HTM81-D4 in Silver
HTM81 D4
Flagship 800 Series Diamond center channel speaker
  • 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
HTM82-D4 in Black
HTM82 D4
Flagship 800 Series Diamond center channel speaker
  • 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
HTM72 S3
HTM72 S3
High-performance 700 Series center channel speaker
  • Performance: High-Performance
  • Tweeters: 1 x 25mm (1 in) Decoupled carbon dome high-frequency
  • Midrange: 2 x 130mm (5 in) Continuum bass/midrange
  • Bass: –
  • Enclosure Design: 2-way vented-box system
HTM71-S3 in Black
HTM71 S3
High-performance 700 series center channel speaker
  • Performance: High-Performance
  • Tweeters: 1 x 25mm (1 in) Decoupled carbon dome high-frequency
  • Midrange: 1 x 130mm (5 in) Continuum cone FST midrange
  • Bass: 2 x 130mm (5 in) Aerofoil profile bass
  • Enclosure Design: 3-way vented-box system
HTM81 D4
Details & Specifications
  • Net weight 32.20kg (71 lb)
  • Dimensions Height: 334mm (13.1 in)
    Width: 847mm (33.3 in)
    Depth: 371mm (14.6 in)
  • Technical features Diamond tweeter
    Solid body Tweeter-on-Top
    Continuum™ cone FST
    Matrix™
    Anti-Resonance plug
    Biomimetic Suspension
    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
  • Cabinet finishes Gloss Black
    White
  • Grille finishes Black
    Grey