Short answer: the KEF Q Concerto Meta. It ranks #11 of 222 bookshelf speakers by sound quality, rated 4.6/5, at $999.99; the MartinLogan Motion XT B100 ranks #139, rated 3.6/5, and costs $1,359.98, so there is not much of a tradeoff to weigh.
The KEF Q Concerto Meta is the more accurate, deeper-bass pick. A neutral three way bookshelf speaker that sounds consistent from seat to seat, with smooth treble that many rivals at its price lack. Its measured preference score, a predictor of how neutral it sounds, is 6.01 against 3.83 for the MartinLogan Motion XT B100. Its bass reaches about 53Hz before falling 3dB, against 71.8Hz for the MartinLogan Motion XT B100. The catch: Radiation pattern measures about ±50°, narrower than the reviewer’s preferred ±60° for a stronger sense of envelopment.
Why pick the MartinLogan Motion XT B100: Premium standmount speakers with a large folded-motion tweeter and high sensitivity that is easy to drive. The catch: The measured response rises strongly at +0.84dB per octave and directivity-index consistency is a poor 4.34, so tonal balance and off-axis behavior are less neutral than the price implies.
Buy the KEF Q Concerto Meta. It is rated higher for sound quality than the MartinLogan Motion XT B100 and costs less, which makes it the one to get unless you need something the other one does better.
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Measured Differences
- Bass depth: the KEF Q Concerto Meta reaches 53 Hz (3 dB down) against 71.8 Hz for the MartinLogan Motion XT B100, about half an octave deeper. You hear more of the lowest bass notes and kick drums.
- Tonal accuracy above the bass: with a subwoofer taking the low end, the KEF Q Concerto Meta scores 7.7 against 6.3 for the MartinLogan Motion XT B100 on the Spinorama preference scale. Its frequency response and off-axis sound are smoother, so voices and instruments sound closer to the recording.
- Efficiency: the MartinLogan Motion XT B100 is rated at 93 dB sensitivity against 84.2 dB for the KEF Q Concerto Meta, so it plays as loud with roughly a third of the amplifier power.
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Specifications Side By Side
| KEF Q Concerto Meta | MartinLogan Motion XT B100 | |
|---|---|---|
| Price | $999.99 per pair | $1,359.98 per pair |
| Ranked | #11 of 222 in Large Size Bookshelf Speakers | #139 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | 50.7Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 53Hz (measured, Erin’s Audio Corner) | 71.8Hz (measured, Erin’s Audio Corner via spinorama.org) |
| Dimensions | 16.3”H x 8.3”W x 12.4”D (414 x 210.8 x 315 mm) | 14.5H x 8W x 12.5D in |
| Impedance | 4 ohms nominal (3.3 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 4 ohms |
| 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 | 1.25 x 2.4” folded-motion XT tweeter, 6.5” Kevlar woofer |
| Sensitivity | 84.2dB (measured average, Erin’s Audio Corner) | 93dB |
| Weight | 20.9 lbs (9.5 kg) each | 20.5 lbs (9.3 kg) each |
| Woofer Cabinet | ported, rear | - |
| Spinorama Preference Score | 6.01 | 3.83 |
| Spinorama Preference Score with Perfect Sub | 7.71 | 6.35 |
| DIY Kit | No | No |
| Enclosure | - | 2-way, rear-ported |
| Country | - | United States (design) |
Where the Ratings Come From
- KEF Q Concerto Meta: Spinorama.org measurements and reviews by Erin’s Audio Corner.
- MartinLogan Motion XT B100: 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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