QB12 Active Sealed 12inch Subwoofer Matt Black (each)

Understanding neighbours required for this powerful sub.       The QB12 design incorporates many features recognisable in the current range of subwoofers notably...

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  • QB12 Active Sealed 12inch Subwoofer Matt Black (each)
  • QB12 Active Sealed 12inch Subwoofer Matt Black (each)
  • QB12 Active Sealed 12inch Subwoofer Matt Black (each)

AU $1,155   On Sale!  $1,445

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**Conditions apply

Understanding neighbours required for this powerful sub.


5 Star Rating 


The QB12 design incorporates many features recognisable in the current range of subwoofers notably the controls and connection panel which is used in both 7060 and 3060. Incorporated into this imposing unit are some well-hidden details including the new cabinet ‘dart brace’ and subtly engineered amplifier heat sink panel on the rear of the cabinet.

The QB12 is finished to complement any bookshelf or tower speaker within the Q Acoustics range.

It’s impeccably built, with a sealed cabinet that makes positioning a little less fussy than it would be with a ported design.

The QB12 is almost cube-shaped and pretty big – so will take some hiding if you want it completely ignored. Part of the beauty of the 3060S, which comes as standard with the 3010i and 3050i 5.1 Cinema Packs, is its slim-line design; you can slot it tidily among the front three channels, or even beneath the sofa. The QB12, on the other hand, is liable to stick out, hence the need for space.


Cabinet Design & Engineering

Dart bracing - Internal bracing provides additional cabinet rigidity and suppresses cabinet resonance.

The ‘dart brace’ provides high axial stiffness directly to the motor system, effectively providing a mechanical ground to the drive unit.

The load is spread to all faces of the cabinet which also rigidly constrains the enclosure walls effectively over the subwoofer’s operating bandwidth.

The ‘dart brace’ not only gives superior mechanical stability to the drive unit over unbraced systems, that can otherwise result in drive unit ‘bounce’ on the mounting fixtures and baffle, but also reduces the ‘ballooning’ effect of the cabinet, critical for subwoofers that inherently contain high internal acoustic pressure.


Other Features:

  • A reinforced MDF cabinet with a 36mm thick baffle.
  • Custom die-cast aluminium heat sink on rear panel supports and cools the ultra-low distortion power amplifier and power supply.
  • Recessed and hidden rear terminal panel, hides all plugs and channels cables neatly out through the base of the subwoofer.
  • Custom designed adjustable spiked feet give firm support on carpeted floor. Reinforced rubber caps supplied for use with wooden floors.


It is designed to work with Q Acoustics’ 3000i suite – the 3010i and 3050i surround packages that have just won What Hi-Fi? Awards again – as well as the Concept 5.1 speaker range. Improving on a class leader is a tall task, but the QB12 proves it has precisely what it takes.

Beneath the grille is a 30cm driver powered by a 220W Texas Instruments TPA3255 Class D amplifier, more than ready to shake the floor of your living room.


Drive Unit

• Long-throw 12” driver delivers high sensitivity and excellent dynamics.
• High Bl motor.
• High stiffness paper cone with straight sides.
• Large 50mm voice coil diameter to reduce thermal compression.


• Ultra-low distortion 220W Class D power amplifier capable of delivering 17A peak current
• Active limiter prevents unpleasant distortion when amplifier over-driven
• Texas Instruments TPA3255 Class D Power Amplifier features an advanced integrated feedback design with proprietary high-speed gate driver error correction (PurePath™ Ultra-HD) delivering ultra-low distortion across the audio band.
• Analogue active filters with Linkwitz-Riley pole-zero shifting result in flat acoustic frequency and linear phase response.
• 0°/180° phase switch to optimise integration with left and right speakers.
• Auto switch-on from standby in the presence of an audio input. Can be overridden to force unit on continuously.

A custom die-cast aluminium heat sink on the rear panel supports and cools the amplifier and power supply, while Q Acoustics has also fitted a brace inside the MDF cabinet to provide mechanical stability to the driver and reduce unwanted vibrations and resonance of the unit itself during playback.

To the rear, you’ll also find a 0/180-degree phase switch as well as level and crossover dials to help integration with the rest of your speaker package, though of course, you’ll also need to go through set-up on your AV receiver for the best results.



  • Enclosure Type Infinite Baffle (sealed)
  • Enclosure Material MDF
  • Drive Units 12” (305mm) High-Excursion
  • Output Power 200 W Class-D (controlled by limiter)
  • Max Output Power 220 W (@1% amplifier THD)
  • Frequency Range 28Hz - 300Hz
  • Overall Dimensions 400 x 400 x 446mm (H x W x D) without spikes
  • Weight 18.5 kg
  • Mains Power 100 V-240 V, 50/60 Hz
  • Input impedance 13 k?
  • Input sensitivity 150 mV, (L=R)
  • (for full power at 50Hz, level set to maximum). 300mV, (L only)
  • Input sensitivity for auto switch-on 1.5 mV (L=R)
  • auto switch-on 3 mV (L only)
  • Crossover frequency range 70 Hz - 225 Hz (12dB/octave)


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