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Q400b Subwoofer

The final ingredient of your new system is of course the seductive Q400b subwoofer. A closed box design housing a 10in. woofer driven by a 200W on-board Class-D amplifier, this discreet cube creates spectacular bass imagery – eloquent, musical and addictively physical. Anchoring your whole sound performance in an all-embracing sensation of immediacy, it completes the acoustic picture.

*Offer available direct from KEF and from your local KEF dealer while supplies last!


Availability: In stock

Regular Price: $699.99

Special Price: $499.99

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The final ingredient of your new system is of course the seductive Q400b subwoofer. A closed box design housing a 10in. woofer driven by a 200W on-board Class-D amplifier, this discreet cube creates spectacular bass imagery – eloquent, musical and addictively physical. Anchoring your whole sound performance in an all-embracing sensation of immediacy, it completes the acoustic picture.

The Q400 subwoofer is a crisp and stylish performer. Featuring a 10" woofer driven by a 200W Class D amplifier, this discrete cube completes your listening experience with punch and style.

Advanced Bass Technologies
Featuring rigid new aluminium cone technology just like the Uni-Q array, the new Q Series advanced bass driver is a tour de force in its own right. A die-cast aluminium chassis rigidly locates the high efficiency vented magnet assembly to prevent unwanted resonance, and the large voice coil ensures impressive power handling. Its musicality is impeccable: seductively tuneful and well controlled, and on the floorstanding models, complemented by dedicated front-firing auxiliary bass radiators (ABRs).

Total System Design
The performance envelope of these sensational new drive units is so generous that the signal needs minimal intermediation – simple first order crossovers are all that’s required, as you can tell from the transparency of the sound and the inaudibly fluent transitions.

  • Click here to learn more about the KEF Q400b subwoofer at KEF.com
  • Customer Reviews

    Well done Review by Jp
    Build Quality
    Sound Quality
    Would you recommend?
    Beautifully crafted, great sounding, easy to integrate (Posted on 1/21/2017)
    Nice speakers Review by bg
    Build Quality
    Sound Quality
    Would you recommend?
    After several weeks of research on the web and talking to my brother who has been building stereo systems including speaker enclosures for 40 years, I decided to go with KEF. I purchased Q300's and the Q400 sub-woofer. To me, the sound is wonderful, much nicer than my previous system. During a visit, my brother commented the speakers are really nice sounding which was nice to hear. He is very picky about his music and audio systems. (Posted on 1/3/2017)
    Great closed subwoofer for nice response and tone Review by Nigel
    Build Quality
    Sound Quality
    Would you recommend?
    I have the Q400b mated with my Q100s and a Marantz PM6005 receiver/amp.
    I'm using high level inputs on the Q400b which has a small adapter for a secure speaker wire connection and easy removal.
    There was a ground loop in my system which caused hum from the sub, but grounding the receiver chassis to one of the screws on the back of the sub worked wonders.

    The sound from the sub is very nice. Controlled tight response and good mids blend very well with the smaller bookshelves.
    The crossover, volume, and bass boost on the sub make it easy to find the sweet spot with your other speakers.
    This will not dig as deep as you would need for a good home theater experience, but that's what you'd expect from a 10" closed box design.

    The finish of the enclosure and quality of the knobs and switches on the back are quite good.
    The matte look of the front matches the rest of the Q series and makes a very sophisticated looking system. (Posted on 1/3/2017)
    Great Review by Mo
    Build Quality
    Sound Quality
    Would you recommend?
    Absolutely fantastic (Posted on 1/1/2017)

    Reviews

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    Model Q400b
    Design Closed-box subwoofer
    Drive Units 1 x 250mm (10in.)
    Frequency Response ±3dB 28Hz - 140Hz
    Amplifier 200W built-in Class-D
    Maximum output (SPL) 110dB
    Low pass filter variable 40Hz - 140Hz, 4th-order
    Low level signal inputs RCA phono sockets
    Speaker level inputs
    Internal volume 23.2 litres
    Power requirements 100 - 240V ac ~ 50/60Hz
    Power consumption 200VA
    Weight 13.6kg (29.9lbs)
    Dimensions
    (H x W x D)
    335 x 330 x 330 mm (13.2 x 13.0 x 13.0 in.)
    ** KEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE. **
    KEF Q Series Speakers Review
    "The KEF Q Series' concentric Uni-Q drivers deliver incredible clarity, exceptional dispersion, and wonderful neutrality, making them super easy to place in virtually any room. Frankly put, they're a stunning value."
    Year: 2016
    Magazine / Issuing Body: Residential Systems
    Country: United States
    Product: Q100, Q300, Q600c, Q400b
    • Click here to read the full review.
     
    KEF Q Series Speakers - Highly Recommended
     
    Year: 2015
    Magazine / Issuing Body: High-Def Digest
    Country: United States
    Product: Q Series Home Theater
     • Click here to read the full review.
     
    hifitest.de Test Results
     “It is a joy to experience how Kefs Q400b works in the fundamental range. Despite the small size of the cabinet its performance in the "deep bass cellar" is amazing. The Q400b also convinces with reasonable features and excellent manufacturing.”
    Year: 2011
    Magazine / Issuing Body: www.hifitest.de
    Country: Germany
    Product: Q400b
     
    Gold Award - Subwoofer
     
    Year: 2011
    Magazine / Issuing Body: Hometheaterphile
    Country: Japan
    Product: Q400b
     
     
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