Short answer: the Ascend Acoustics Sierra-2EX V2. It ranks #41 of 222 bookshelf speakers by sound quality, rated 4.3/5, at $1,748. The Triangle Borea BR03 ranks #198, rated 2.8/5, at $399, $1,349 cheaper, which does not close the gap in sound quality.
Why pick the Triangle Borea BR03: A budget French bookshelf speaker with dual front ports, decent bass for the price and solid, well braced build quality. The catch: A noticeable mid-range suckout, most pronounced in the upper mid-range/lower treble, that the reviewer attributes to cabinet resonances and driver breakup rather than a deliberate voicing choice: it makes vocals and instruments sound recessed and thin rather than warm.
The Ascend Acoustics Sierra-2EX V2 is the more accurate choice. A ribbon tweeter bookshelf speaker with hand matched pairs, a frequency response printout for each unit, and a long seven year warranty. Its measured preference score, a predictor of how neutral it sounds, is 5.88 against 4.03 for the Triangle Borea BR03. The tradeoff: On-axis response is relatively uneven, with an average deviation of about 0.45dB, so a listener sitting dead center may notice more unevenness than with smoother AsciLab or Ascend towers.
Buy the Ascend Acoustics Sierra-2EX V2. It is rated higher for sound quality, and the $1,349 saving on the Triangle Borea BR03 is not enough to make up the difference.
Want more options? Browse the full Passive Home rankings.
A budget French bookshelf speaker with dual front ports, decent bass for the price and solid, well braced build quality.
A ribbon tweeter bookshelf speaker with hand matched pairs, a frequency response printout for each unit, and a long seven year warranty.
Prices on this page were last checked October 31, 2026 at 7:11 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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Specifications Side By Side
| Triangle Borea BR03 | Ascend Acoustics Sierra-2EX V2 | |
|---|---|---|
| Price | $399.00 per pair | $1,748 per pair |
| Ranked | #198 of 222 in Large Size Bookshelf Speakers | #41 of 222 in Large Size Bookshelf Speakers |
| Drivers | 6.5” natural cellulose midwoofer, 1” (25mm) EFS silk dome tweeter | RAAL 10mm true ribbon tweeter, 6” SEAS Excel Curv cone woofer |
| Crossover Frequency | 3600Hz | - |
| Dimensions | 14.96”H x 8.11”W x 12.36”D | 14.3”H x 7.5”W x 10.5”D (362 x 190 x 267 mm) |
| Weight | 13.2 lbs (6 kg) each | 20.1 lbs (9.1 kg) each |
| Impedance | 8 ohms nominal (manufacturer spec), 4.2 ohms minimum (measured, Erin’s Audio Corner) | 8 ohms nominal |
| Sensitivity | 87.5dB (measured at 2.83V/1m, Erin’s Audio Corner) | 85dB @ 2.83V/1m anechoic (manufacturer) |
| Bass Extension (-3dB) | 57Hz (measured, Erin’s Audio Corner) | 58.6Hz (measured, spinorama.org vendor data) |
| Bass Extension (-10dB) | 42Hz (measured, Erin’s Audio Corner) | 42.4Hz (measured, spinorama.org vendor data) |
| Recommended Power | 100W | - |
| Woofer Cabinet | ported, dual front ports | - |
| Spinorama Preference Score | 4.03 | 5.88 |
| Spinorama Preference Score with Perfect Sub | 6.38 | 7.95 |
| DIY Kit | No | No |
| Enclosure | - | ported |
| Power Handling | - | 150W continuous, 300W peak |
| Frequency Response | - | 51-27,000Hz +/-3dB (manufacturer) |
| Bass Extension (-6dB) | - | 51.3Hz (measured, spinorama.org vendor data) |
| Warranty | - | 7 years parts and labor |
| Country | - | United States |
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