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 Dynaudio Contour 20i ranks #96, rated 3.9/5, and costs $5,750, so there is not much of a tradeoff to weigh.
The Ascend Acoustics Sierra-2EX V2 is the better-sounding choice. A ribbon tweeter bookshelf speaker with hand matched pairs, a frequency response printout for each unit, and a long seven year warranty. 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.
What the Dynaudio Contour 20i does well: Beautifully built bookshelf speakers with wide, spacious sound, clean output at high volume, and bass that blends easily near a wall. Watch for: Notably room-dependent: sounds too bright in the lower treble in smaller rooms with close sidewalls, needing sidewall absorption to sound neutral, while performing better in larger or more open rooms without that treatment.
Buy the Ascend Acoustics Sierra-2EX V2. It is rated higher for sound quality than the Dynaudio Contour 20i and costs less, which makes it the one to get unless you need something the other one does better.
Still deciding? The full Passive Home rankings cover every ranked option.
A ribbon tweeter bookshelf speaker with hand matched pairs, a frequency response printout for each unit, and a long seven year warranty.
Beautifully built bookshelf speakers with wide, spacious sound, clean output at high volume, and bass that blends easily near a wall.
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
| Ascend Acoustics Sierra-2EX V2 | Dynaudio Contour 20i | |
|---|---|---|
| Price | $1,748 per pair | $5750 per pair |
| Ranked | #41 of 222 in Large Size Bookshelf Speakers | #96 of 222 in Large Size Bookshelf Speakers |
| Enclosure | ported | - |
| Drivers | RAAL 10mm true ribbon tweeter, 6” SEAS Excel Curv cone woofer | 18 cm MSP woofer, 28mm Esotar 2i with Hexis tweeter |
| Dimensions | 14.3”H x 7.5”W x 10.5”D (362 x 190 x 267 mm) | 17.4”H x 8.5”W x 14.2”D (442 x 215.9 x 360.7 mm) |
| Weight | 20.1 lbs (9.1 kg) each | 30.9 lbs (14 kg) each |
| Sensitivity | 85dB @ 2.83V/1m anechoic (manufacturer) | 82.5dB |
| Impedance | 8 ohms nominal | 4 ohms |
| Power Handling | 150W continuous, 300W peak | - |
| Frequency Response | 51-27,000Hz +/-3dB (manufacturer) | - |
| Bass Extension (-6dB) | 51.3Hz (measured, spinorama.org vendor data) | - |
| Bass Extension (-3dB) | 58.6Hz (measured, spinorama.org vendor data) | 56Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 42.4Hz (measured, spinorama.org vendor data) | 32Hz (measured, Erin’s Audio Corner) |
| Warranty | 7 years parts and labor | - |
| Country | United States | - |
| Spinorama Preference Score | 5.88 | - |
| Spinorama Preference Score with Perfect Sub | 7.95 | - |
| DIY Kit | No | No |
| Woofer Cabinet | - | ported, rear |
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