Short answer: the AsciLab C6B. It ranks #11 of 222 large bookshelf speakers by sound quality, ahead of the KEF at #6, and it costs $145.01 less.
The AsciLab’s dispersion behaves in a way most two-way speakers don’t. Its horizontal radiation actually widens at higher frequencies instead of narrowing, keeping image focus and soundstage depth consistent whether the speakers are toed in or out, with a 5-10 degree sweet spot found in testing. Vertical radiation stays wide straight through the 2kHz crossover region too, so the sound doesn’t collapse when you stand up, unusual at this price. The KEF, by contrast, measures a narrower ±50° radiation pattern, tighter than the reviewer’s preferred ±60° for a strong sense of envelopment, and needs to be aimed closer to on-axis or its rolled-off top end starts to sound dark.
Distortion and value both favor the AsciLab. Its midrange and tweeter distortion stay very low even at 96dB, holding up against speakers several times its price in that regard, and reviewers have called it the best-value bookshelf speaker in its class. The KEF’s real strength is that its directivity holds remarkably steady from lower treble into upper treble, a range where many similarly priced speakers narrow sharply, and it was one of the reviewer’s top 10 picks under $1,500 in its own right.
Bass extension is essentially tied. Both roll off around the same point in-room, so neither has an edge that would justify choosing on bass alone. The AsciLab does dip to a lower minimum impedance (2.6 ohms versus the KEF’s 3.3 ohms), so it wants a solid 4-ohm-capable amplifier, ideally 100W or more.
Buy the AsciLab C6B. It ranks higher, costs less, and its dispersion characteristics are more forgiving of real-room placement.
Buy the KEF Q Concerto Meta only if you specifically prefer its brand ecosystem or the Crutchfield support and warranty path that comes with buying from an established retailer.
Still deciding? The full Passive Home rankings cover every ranked option.
Measured Differences
- Tonal accuracy above the bass: with a subwoofer taking the low end, the AsciLab C6B scores 8.3 against 7.7 for the KEF Q Concerto Meta on the Spinorama preference scale. Its frequency response and off-axis sound are smoother, so voices and instruments sound closer to the recording.
- Close enough not to matter: bass extension (35 Hz vs 35 Hz, 10 dB down).
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Specifications Side By Side
| KEF Q Concerto Meta | AsciLab C6B | |
|---|---|---|
| Price | $999.99 per pair | $1145 per pair |
| Ranked | #11 of 222 in Large Size Bookshelf Speakers | #6 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | 35Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 53Hz (measured, Erin’s Audio Corner) | 54Hz (measured, Erin’s Audio Corner) |
| Dimensions | 16.3”H x 8.3”W x 12.4”D (414 x 210.8 x 315 mm) | 15.7”H x 8”W x 10.4”D (398.8 x 203.2 x 264.2 mm) |
| Impedance | 4 ohms nominal (3.3 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 4 ohms nominal, 2.6 ohms minimum (measured, Erin’s Audio Corner) |
| Drivers | 165 mm (6.5 in.) hybrid aluminium cone woofer, 100 mm (4 in.) aluminium cone midrange, 19 mm (0.75 in.) vented aluminium dome with MAT tweeter | 6” Aluminium Ceramic Cone with cast Aluminium Chassis woofer, 1” Aluminium Ceramic Dome tweeter |
| Sensitivity | 84.2dB (measured average, Erin’s Audio Corner) | 85.6dB (measured, Erin’s Audio Corner) |
| Weight | 20.9 lbs (9.5 kg) each | 18.5 lbs (8.4 kg) each |
| Woofer Cabinet | ported, rear | passive radiator |
| Spinorama Preference Score | 6.01 | 6.33 |
| Spinorama Preference Score with Perfect Sub | 7.71 | 8.28 |
| DIY Kit | No | No |
Watch Them Compared
Videos and reviews that test both speakers side by side.
Where the Ratings Come From
- KEF Q Concerto Meta: Spinorama.org measurements and reviews by Erin’s Audio Corner.
- AsciLab C6B: Spinorama.org measurements and reviews by Erin’s Audio Corner.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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