Short answer: the KEF Q Concerto Meta. It ranks #11 of 131 bookshelf speakers by sound quality, rated 4.6/5, at $1,399.99; the MartinLogan Motion XT B100 ranks #81, rated 3.6/5, and costs $1,699.98, so there is not much of a tradeoff to weigh.
The case for the KEF Q Concerto Meta: Really good in-room neutrality with consistent horizontal directivity from seat to seat. The tradeoff: 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: A premium 6.5-inch standmount with MartinLogan’s large folded-motion tweeter and high rated sensitivity. 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.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| KEF Q Concerto Meta | MartinLogan Motion XT B100 | |
|---|---|---|
| Price | $1,399.99 per pair | $1,699.98 per pair |
| Ranked | #11 of 131 in Large Size Bookshelf Speakers | #81 of 131 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) |
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Prices on this page were last checked September 30, 2026 at 2:57 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
KEF Q Concerto Meta: $1,399.99 per pair Amazon Crutchfield eBay
Pros: Really good in-room neutrality with consistent horizontal directivity from seat to seat. Directivity holds remarkably steady from lower treble into upper treble, where many similarly-priced speakers narrow sharply as frequency rises: one of the reviewer’s top 10 picks under $1,500. Measured bass extension of 53Hz (-3dB), with a measured sensitivity of 84.2dB.
Cons: Radiation pattern measures about ±50°, narrower than the reviewer’s preferred ±60° for a stronger sense of envelopment. Needs to be pointed closer to on-axis rather than heavily toed out: combined with its rolled-off, shelved-down top end, too much toe-out makes it sound noticeably dark.
Full KEF Q Concerto Meta review and specifications →
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 53Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 16.3”H x 8.3”W x 12.4”D (414 x 210.8 x 315 mm) |
| 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 |
| Impedance | 4 ohms nominal (3.3 ohms minimum above 80Hz, measured by Erin’s Audio Corner) |
| Sensitivity | 84.2dB (measured average, Erin’s Audio Corner) |
| Spinorama Preference Score | 6.01 |
| Spinorama Preference Score with Perfect Sub | 7.71 |
| Weight | 20.9 lbs (9.5 kg) each |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: HiFi Perfection? KEF CONCERTO META Delivers! More from Erin’s Audio Corner →
- Erin’s Audio Corner Website KEF Q Concerto Meta
- Erin’s Audio Corner: I Tested 250 Speakers So You Don’t Have To!
- Erin’s Audio Corner: HiFi Perfection? KEF CONCERTO META Delivers!
- Erin’s Audio Corner: My Absolute Favorite Products of 2024 Revealed
- Erin’s Audio Corner Measurements (spinorama.org)
- Head-to-Head Comparisons
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MartinLogan Motion XT B100: $1,699.98 per pair MartinLogan Dealer Network eBay
Pros: A premium 6.5-inch standmount with MartinLogan’s large folded-motion tweeter and high rated sensitivity. Erin’s data predicts 55Hz in-room extension, a 6.35 subwoofer-assisted preference score and good 0.153 sound-power smoothness. Measured bass extension of 71.8Hz (-3dB).
Cons: 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. The cabinet is large, heavy and $850 per pair before stands.
Full MartinLogan Motion XT B100 review and specifications →
| Bass Extension (-10dB) | 50.7Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
|---|---|
| Bass Extension (-3dB) | 71.8Hz (measured, Erin’s Audio Corner via spinorama.org) |
| Country | United States (design) |
| DIY Kit | No |
| Dimensions | 14.5H x 8W x 12.5D in |
| Drivers | 1.25 x 2.4” folded-motion XT tweeter, 6.5” Kevlar woofer |
| Enclosure | 2-way, rear-ported |
| Impedance | 4 ohms |
| Sensitivity | 93dB |
| Spinorama Preference Score | 3.83 |
| Spinorama Preference Score with Perfect Sub | 6.35 |
| Weight | 20.5 lbs (9.3 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons