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 Ascend Acoustics Sierra Duo V2 Ribbon ranks #64, rated 4.1/5, and costs $1,688, which makes this an easy call rather than a real tradeoff.
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 4.53 for the Ascend Acoustics Sierra Duo V2 Ribbon. Its bass reaches about 53Hz before falling 3dB, against 79.1Hz for the Ascend Acoustics Sierra Duo V2 Ribbon. Watch for: Radiation pattern measures about ±50°, narrower than the reviewer’s preferred ±60° for a stronger sense of envelopment.
Why pick the Ascend Acoustics Sierra Duo V2 Ribbon: A compact dual woofer bookshelf speaker with a ribbon tweeter, very consistent dispersion, and flexible vertical or horizontal mounting. The catch: Bass measures 79.1Hz at -3dB, 64.5Hz at -6dB, and 43.9Hz at -12dB, and the 0.645dB on-axis average absolute deviation trails the Titan version’s 0.585dB.
Buy the KEF Q Concerto Meta. It is rated higher for sound quality than the Ascend Acoustics Sierra Duo V2 Ribbon and costs less, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Passive Home rankings.
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Specifications Side By Side
| KEF Q Concerto Meta | Ascend Acoustics Sierra Duo V2 Ribbon | |
|---|---|---|
| Price | $999.99 per pair | $1,688 per pair |
| Ranked | #11 of 222 in Large Size Bookshelf Speakers | #64 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 35Hz (measured, Erin’s Audio Corner) | approximately 50Hz (measured, spinorama.org) |
| Bass Extension (-3dB) | 53Hz (measured, Erin’s Audio Corner) | 79.1Hz (measured, spinorama.org) |
| Dimensions | 16.3”H x 8.3”W x 12.4”D (414 x 210.8 x 315 mm) | 16.25 x 5.75 x 6 in each |
| Impedance | 4 ohms nominal (3.3 ohms minimum above 80Hz, measured by Erin’s Audio Corner) | 8 ohms nominal |
| 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 | Two 4.5-inch glass-fiber woofers; custom RAAL true ribbon tweeter |
| Sensitivity | 84.2dB (measured average, Erin’s Audio Corner) | 86dB at 2.83V/1m anechoic |
| Weight | 20.9 lbs (9.5 kg) each | 12.3 lbs (5.6 kg) each |
| Woofer Cabinet | ported, rear | - |
| Spinorama Preference Score | 6.01 | 4.53 |
| Spinorama Preference Score with Perfect Sub | 7.71 | 7.15 |
| DIY Kit | No | No |
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