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KEF X300A Active Speakers (Pair)

Found it cheaper? Click here. SKU: 6859
Ex VAT: 499.17

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Condition:Brand new in original retail packaging

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Product Video


Warranty length 1 Year
Colour Black
Brand KEF Speakers

Tech Specs

- System type: Two-way bass reflex
- Drive units: Uni-Q driver array
- HF: 25mm vented aluminium dome
- LF/MF: 130mm magnesium/al alloy
- Freq response (+/- 3dB): 58Hz - 28kHz
- Frequency range (- 6dB): 49Hz - 45kHz
- Max peak SPL: 104dB
- Amplifier Type: Twin Class AB
- Amp Power: LF/HF, 50/20W
- AC power input: 100-120 VAC, 50/60 Hz
- Power: 220-240V AC, 50Hz
- Analogue input AUX: 3.5mm stereo jack
- Digital input: USB 2.0 Mini USB B
- Resolution: Up to 24-bit
- Sampling rate: Up to 96kHz
- Controls: Balance control, volume control
- Dimensions (HWD): 280 x 180 x 243mm
- Weight: 7.5kg (16.5lbs) per speaker


Note: Apple Mac pictured not included!

Product Description

KEF X300A active speakers are a game changer for both KEF and for the active speaker market, a true hi-fi quality speaker in active format - perfect for enjoying stunning audio performance with your computer, Mac, mp3 player, smartphone. Simply plug into either the USB input or 3.5mm jack input, power up and play!

True hi-fi speakers

X300A features KEF’s state-of-the-art Uni-Q driver. Uniquely, each speaker features audiophile quality class AB amplifiers, rather than having one active and one passive speaker. The boffins at KEF determined this offers better sound quality than having an active-passive configuration and as a result the connection between the two speakers is digital via USB.

If that wasn't enough, each speaker features twin amplifiers - one for high frequencies (HF) and one for low frequencies (LF), making these the first audiophile bi amped active speakers we've heard!

Easy to use

You don't need to be an expert to enjoy hi-fi sound from these speakers. Simply connect them to your computer by a ‘distortion free’ USB all-digital link to provide high resolution 96kHz/24 bit quality audio. You can connect another audio device via 3.5mm minijack.

How do they sound?

From music source to sound output, the X300A convey the true sound of the music and are some of the finest active speakers available. When we first heard these in the Audio Affair showroom, we were shocked by the performance on offer. As a step-up from more common lower model active speakers, these are first and foremost pure hi-fi speakers.

Like baby KEF LS50 speakers with active bi-amping in each speaker, the X300A conveys all the energy, excitement and emotion from anything you could think to play. They also have the benefit of a "desktop/stands" switch that will fine tune to sound for placement either on your desk or on dedicated speaker stands.

The X300A truly are a game changer both for the hi-fi market and for KEF. Available both to order online or to demo in our Birmingham UK showroom by prior appointment.

Press Reviews

  • These USB speakers might look expensive, but they're so good they rival proper hi-fi boxes for sound quality...plug each cabinet into the mains, connect the left speaker to a spare USB port on your PC or laptop, and the speakers' integrated amplifiers and DACs take care of the rest.They're pretty large, measuring 180mm wide and 243mm deep, and heavy, too, weighing 7.5kg each; it's clear these are no ordinary PC speakers. (PC Pro Magazine)

  • Thankfully, the X300As are easily good enough to replace a pair of standard, passive speakers atop your living room speaker stands. And with 50W amps powering the 5.25in mid/low frequency drivers in each speaker, plus 20W amps behind the exciting-looking Uni-Q tweeters, there's more than enough power to fill a medium-sized room. (PC Pro Magazine)

  • Listening to music on these speakers is a visceral experience: vocals and solo instruments are delivered with astonishing clarity and realism, and although the bass response is limited - the X300As roll off at around 58Hz – bass drums and beats are delivered with such solidity and control that we never felt we were missing out. (PC Pro Magazine)

  • In terms of sound quality, the X300As are the match of any speaker system we've heard at the price. We compared them with our reference pair of £800 Adam Audio A7x's, and in some respects we preferred the smaller KEFs – less deep bass, perhaps, but a more forward, appealing mid-range. (PC Pro Magazine)

  • A niche design, but these KEF speakers will please some with their smooth, detailed sound. Their traditional bookshelf speaker-like looks combine with a lovely graphite finish and KEF’s trademark tangerine waveguide to produce units that are as traditional as they are modern. They’re certainly stylish. No matter how loud you play the X300As (and we played them very loud indeed) no nasty buzz, boom or fuzziness appears to ruin your party-rocking levels of enjoyment, and the three elements of the tonal spectrum are as balanced as you could want. These KEFs have a character that’s easy to listen to, but hard to fall in love with – and that’s despite the exceptional integration and superb detail. And that – combined with the fact that they’re going to be of such niche appeal – means the KEF X300A speakers will have to settle for four stars. (What Hi-Fi Magazine)

Customer Reviews

  • Rod

    10 Jun 2013

    Im a long time hi-fi user and have always used quality separates and speakers, but didn't have space in my office for a full system. Id heard several active speakers and wasnt impressed when these were recommended to me. I struggled to get over my preconceptions (could they really be as good as separates even when they cost this much??) but I couldnt have been more wrong. Much to my dismay, these sound BETTER than my almost 10 year old hi-fi system and in my opinion are a game changer. The only downside is that both speakers are active and need plugging in, but as a solution for listening to music from PC, these are perfect.
  • Marc

    28 May 2013

    I listened to all the contenders, less and more expensive and these are the best actives by far. The KEF sound is so natural, so pure, so clear, they get me excited with almost any music. A bit big for on a desktop, but on proper stands they are unbeatable. Well worth the investment.
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