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 Theory Audio sb25 ranks #70, rated 3.7/5, and costs $3,400, so there is little reason to consider the other one.
What the KEF Q Concerto Meta does well: 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.
The case for the Theory Audio sb25: Strong local Spinorama scores of 4.33 raw and 6.99 with a subwoofer, plus very wide, well-controlled dispersion and high output from a cabinet only 3.8 inches deep. The catch: It requires a Theory controller-amplifier channel and model-specific DSP, making it much less straightforward than a normal passive speaker.
Buy the KEF Q Concerto Meta. It is rated higher for sound quality than the Theory Audio sb25 and costs less, so only choose the other one for a particular feature it does better.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| KEF Q Concerto Meta | Theory Audio sb25 | |
|---|---|---|
| Price | $1,399.99 per pair | $3,400 per pair |
| Ranked | #11 of 131 in Large Size Bookshelf Speakers | #70 of 131 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | 46Hz (manufacturer specified) |
| Bass Extension (-3dB) | 53Hz (measured, Erin’s Audio Corner) | 67.4Hz (measured, spinorama.org) |
| Dimensions | 16.3”H x 8.3”W x 12.4”D (414 x 210.8 x 315 mm) | 21.5H x 9.5W x 3.8D 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 | Dual 5-inch carbon-fiber woofers, 1.4-inch compression driver |
| Sensitivity | 84.2dB (measured average, Erin’s Audio Corner) | 94dB (manufacturer specified, 2.83V/1m) |
| Weight | 20.9 lbs (9.5 kg) each | 22.9 lbs (10.4 kg) each |
| Woofer Cabinet | ported, rear | - |
| Spinorama Preference Score | 6.01 | 4.33 |
| Spinorama Preference Score with Perfect Sub | 7.71 | 6.99 |
| DIY Kit | No | No |
| Enclosure | - | Passive sealed surface/tabletop speaker |
| Frequency Response | - | 54Hz-23kHz (-6dB) |
| Coverage | - | 125 degrees conical |
| Power Handling | - | 200W AES, 800W peak |
| Maximum SPL | - | 123dB peak at 1m |
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- KEF Q Concerto Meta vs Perlisten S4b
- KEF Reference 1 Meta vs KEF Q Concerto Meta
- KEF Q Concerto Meta vs GR-Research NX-Studio
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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
- KEF Q Concerto Meta vs KEF R3 Meta
- KEF Q Concerto Meta vs AsciLab F6B
- KEF Q Concerto Meta vs Wharfedale Aura 2
- KEF Q Concerto Meta vs Revel M106
- KEF Q Concerto Meta vs KEF R3
- KEF Q Concerto Meta vs Audio First Cadentia 3
- KEF Q Concerto Meta vs AsciLab C6B
- KEF Q Concerto Meta vs Buchardt Audio E50
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Theory Audio sb25: $3,400 per pair World Wide Stereo eBay
Pros: Strong local Spinorama scores of 4.33 raw and 6.99 with a subwoofer, plus very wide, well-controlled dispersion and high output from a cabinet only 3.8 inches deep. Optional tabletop stands allow conventional bookshelf or console placement. Measured bass extension of 67.4Hz (-3dB).
Cons: It requires a Theory controller-amplifier channel and model-specific DSP, making it much less straightforward than a normal passive speaker. The installation-focused form factor, per-speaker pricing and 60Hz measured extension limit value for ordinary stereo systems.
Full Theory Audio sb25 review and specifications →
| Bass Extension (-10dB) | 46Hz (manufacturer specified) |
|---|---|
| Bass Extension (-3dB) | 67.4Hz (measured, spinorama.org) |
| Coverage | 125 degrees conical |
| DIY Kit | No |
| Dimensions | 21.5H x 9.5W x 3.8D in |
| Drivers | Dual 5-inch carbon-fiber woofers, 1.4-inch compression driver |
| Enclosure | Passive sealed surface/tabletop speaker |
| Frequency Response | 54Hz-23kHz (-6dB) |
| Impedance | 4 ohms |
| Maximum SPL | 123dB peak at 1m |
| Power Handling | 200W AES, 800W peak |
| Sensitivity | 94dB (manufacturer specified, 2.83V/1m) |
| Spinorama Preference Score | 4.33 |
| Spinorama Preference Score with Perfect Sub | 6.99 |
| Weight | 22.9 lbs (10.4 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons