Short answer: the KEF R3 Meta. It ranks #10 of 222 bookshelf speakers by sound quality, rated 4.6/5, at $2,499.99. The Ascend Acoustics Sierra Duo V2 Ribbon ranks #64, rated 4.1/5, at $1,688, $811.99 cheaper, which does not close the gap in sound quality.
The KEF R3 Meta is the more accurate option. A three way bookshelf speaker with KEF’s coaxial driver, superb accuracy that holds across the room, and bass that reaches deep for its size. Its measured preference score, a predictor of how neutral it sounds, is 6.10 against 4.53 for the Ascend Acoustics Sierra Duo V2 Ribbon. The tradeoff: Pointed straight on-axis, there’s a 1-2dB bump around 9kHz that stays consistent across angles thanks to the constant-directivity waveguide: only toeing the speaker out about 10° tames it.
The case for 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 R3 Meta. It is rated higher for sound quality, and the $811.99 saving on the Ascend Acoustics Sierra Duo V2 Ribbon is not enough to make up the difference.
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Specifications Side By Side
| KEF R3 Meta | Ascend Acoustics Sierra Duo V2 Ribbon | |
|---|---|---|
| Price | $2,499.99 per pair | $1,688 per pair |
| Ranked | #10 of 222 in Large Size Bookshelf Speakers | #64 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 37Hz (measured, Erin’s Audio Corner) | approximately 50Hz (measured, spinorama.org) |
| Bass Extension (-3dB) | 76Hz (measured, Erin’s Audio Corner) | 79.1Hz (measured, spinorama.org) |
| Dimensions | 16.6”H x 7.9”W x 13.2”D (421.6 x 200.7 x 335.3 mm) | 16.25 x 5.75 x 6 in each |
| Impedance | 4 ohms nominal (3.2 ohms minimum above 80Hz, measured, Erin’s Audio Corner) | 8 ohms nominal |
| Drivers | 6.5” Hybrid aluminum ported woofer, 5” aluminum cone midrange, 1” vented aluminium dome with MAT tweeter | Two 4.5-inch glass-fiber woofers; custom RAAL true ribbon tweeter |
| Sensitivity | 85.9dB (measured, Erin’s Audio Corner; 87dB manufacturer specified) | 86dB at 2.83V/1m anechoic |
| Weight | 27.3 lbs (12.4 kg) each | 12.3 lbs (5.6 kg) each |
| Woofer Cabinet | ported | - |
| Spinorama Preference Score | 6.10 | 4.53 |
| Spinorama Preference Score with Perfect Sub | 7.91 | 7.15 |
| DIY Kit | No | No |
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