Short answer: the Ascend Acoustics Sierra-LX if sound quality matters most, the Ascend Acoustics CBM-170 SE2 if price matters most. The Ascend Acoustics Sierra-LX ranks #37 of 222 bookshelf speakers, rated 4.3/5, at $1,598. The Ascend Acoustics CBM-170 SE2 ranks #113, rated 3.8/5, at $468, $1,130 cheaper.
What the Ascend Acoustics CBM-170 SE2 does well: Compact two-way bookshelf speakers with a SEAS tweeter, a very flat midrange and smooth sound that suits most rooms. The catch: A narrow dip in the on-axis and listening-window response appears in the 3-5kHz range (down to about -2.7dB), mirrored by a matching dip in the directivity index at the same frequencies: likely a brief widening of dispersion right at the tweeter/woofer crossover.
The Ascend Acoustics Sierra-LX is the better-sounding, deeper-bass pick. A compact bookshelf speaker with very neutral, flat sound, a wide soundstage, and surprisingly deep bass in a bamboo cabinet. Its bass reaches about 47Hz before falling 3dB, against 70Hz for the Ascend Acoustics CBM-170 SE2. The catch: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels.
Buy the Ascend Acoustics CBM-170 SE2 when the price outweighs sound quality for you, and the Ascend Acoustics Sierra-LX when sound quality outweighs the price instead.
Still deciding? The full Passive Home rankings cover every ranked option.
Compact two-way bookshelf speakers with a SEAS tweeter, a very flat midrange and smooth sound that suits most rooms.
A compact bookshelf speaker with very neutral, flat sound, a wide soundstage, and surprisingly deep bass in a bamboo cabinet.
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 CBM-170 SE2 | Ascend Acoustics Sierra-LX | |
|---|---|---|
| Price | $468 per pair | $1598 per pair |
| Ranked | #113 of 222 in Large Size Bookshelf Speakers | #37 of 222 in Large Size Bookshelf Speakers |
| Bass Extension (-3dB) | 70Hz (measured, manufacturer spinorama data) | 47Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 50Hz (measured, manufacturer spinorama data) | 38Hz (measured, Erin’s Audio Corner) |
| Sensitivity | 86.8dB (2.83V/1m, measured, manufacturer spinorama data; 87dB manufacturer specified) | 81dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Drivers | 27mm custom SEAS soft dome tweeter, 6.5” proprietary composite polygel cone woofer | 6” aluminum cone woofer, 26mm dome tweeter |
| Dimensions | 12H x 9W x 9.5D in | 14.3” x 7.5” x 10.5” (362 x 191 x 267 mm) |
| Weight | 15 lbs (6.8 kg) each | 20.9 lbs (9.5 kg) |
| Impedance | 8 ohms | 8 ohms nominal (5.5 ohms minimum) |
| Power Handling | 200W continuous, 400W peak | 350W continuous, 500W peak |
| Woofer Cabinet | ported, rear | Bass reflex, flared rear port |
| Spinorama Preference Score | 6.30 | 6.63 |
| Spinorama Preference Score with Perfect Sub | 8.66 | 8.44 |
| DIY Kit | No | No |
| Frequency Response | - | 28Hz - 23kHz (in-room, manufacturer specified) |
| Country | - | USA |
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