Short answer: the Ascend Acoustics CMT-340 SE2. It ranks #24 of 216 bookshelf speakers by sound quality, rated 4.4/5, at $798; the Ascend Acoustics Sierra-LX ranks #37, rated 4.3/5, and costs $1,598, so there is not much of a tradeoff to weigh.
The Ascend Acoustics Sierra-LX is the more accurate, deeper-bass choice. Very neutral, flat frequency response: within about plus or minus 1.5dB ignoring one narrow dip. Its measured preference score, a predictor of how neutral it sounds, is 6.63 against 5.33 for the Ascend Acoustics CMT-340 SE2. Its bass reaches about 47Hz before falling 3dB, against 77.6Hz for the Ascend Acoustics CMT-340 SE2. The tradeoff: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels.
Why pick the Ascend Acoustics CMT-340 SE2: High-quality manufacturer Klippel NFS data shows 0.295dB on-axis average absolute deviation, 0.531 listening-window smoothness, and a strong 7.99 preference score with a subwoofer. The tradeoff: Bass rolls off early for the cabinet size, measuring 77.6Hz at -3dB, 64.5Hz at -6dB, and 48.3Hz at -12dB; the preference score without a subwoofer is only 5.33.
Buy the Ascend Acoustics CMT-340 SE2. It is rated higher for sound quality than the Ascend Acoustics Sierra-LX 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.
Specifications Side By Side
| Ascend Acoustics Sierra-LX | Ascend Acoustics CMT-340 SE2 | |
|---|---|---|
| Price | $1598 per pair | $798 per pair |
| Ranked | #37 of 216 in Large Size Bookshelf Speakers | #24 of 216 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) | approximately 53Hz (measured, spinorama.org) |
| Bass Extension (-3dB) | 47Hz (measured, Erin’s Audio Corner) | 77.6Hz (measured, spinorama.org) |
| Dimensions | 14.3” x 7.5” x 10.5” (362 x 191 x 267 mm) | 21 x 7.5 x 10.5 in each |
| Impedance | 8 ohms nominal (5.5 ohms minimum) | 8 ohms nominal |
| Sensitivity | 81dB (2.83V/1m, measured by Erin’s Audio Corner) | 92dB at 2.83V/1m anechoic |
| Drivers | 6” aluminum cone woofer, 26mm dome tweeter | Two 6.5-inch woofers; 27mm soft-dome tweeter |
| Weight | 20.9 lbs (9.5 kg) | 29.1 lbs (13.2 kg) each |
| Woofer Cabinet | Bass reflex, flared rear port | - |
| Power Handling | 350W continuous, 500W peak | 240W continuous; 400W short-term peak |
| Frequency Response | 28Hz - 23kHz (in-room, manufacturer specified) | - |
| Country | USA | - |
| Spinorama Preference Score | 6.63 | 5.33 |
| Spinorama Preference Score with Perfect Sub | 8.44 | 7.99 |
| DIY Kit | No | No |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared.
Measurement data: Ascend Acoustics Sierra-LX (measured by the manufacturer) and Ascend Acoustics CMT-340 SE2 (measured by the manufacturer), via spinorama.org.
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Prices on this page were last checked October 14, 2026 at 2:38 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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The Two Speakers In Full
Ascend Acoustics Sierra-LX: $1598 per pair Ascend Acoustics $1598 eBay
Same family: the Ascend Acoustics Sierra 1 v2 (smaller bookshelf, rated 4.7/5), the Ascend Acoustics Sierra-2EX V2 (smaller bookshelf, ranked lower, rated 4.3/5), the Ascend Acoustics Sierra Titan Tower (floorstanding, rated 4.4/5) and the Ascend Acoustics Sierra Horizon V2 (center, estimated 4.3/5). See every Ascend Sierra generation.
Pros: Very neutral, flat frequency response: within about plus or minus 1.5dB ignoring one narrow dip. Bass extension down to about 40Hz in-room despite the compact size. Wide, well-balanced soundstage (~60 degrees). Solid build quality with a laminated bamboo cabinet. Measured bass extension of 47Hz (-3dB), with a measured sensitivity of 81dB.
Cons: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels. Noticeable midrange distortion becomes audible above about 82-83dB SPL. A narrow dip around 3.5kHz on-axis in larger rooms without sidewall reflections: toeing the speakers out 10-20 degrees fills it in, but adds some brightness to the treble. Sensitive to listening height: sitting even slightly above or below tweeter level noticeably shifts the tonal balance.
Full Ascend Acoustics Sierra-LX review and specifications →
| Released | Apr 2022 (4 years ago) |
|---|---|
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 47Hz (measured, Erin’s Audio Corner) |
| Country | USA |
| DIY Kit | No |
| Dimensions | 14.3” x 7.5” x 10.5” (362 x 191 x 267 mm) |
| Drivers | 6” aluminum cone woofer, 26mm dome tweeter |
| Frequency Response | 28Hz - 23kHz (in-room, manufacturer specified) |
| Impedance | 8 ohms nominal (5.5 ohms minimum) |
| Power Handling | 350W continuous, 500W peak |
| Sensitivity | 81dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Spinorama Preference Score | 6.63 |
| Spinorama Preference Score with Perfect Sub | 8.44 |
| Weight | 20.9 lbs (9.5 kg) |
| Woofer Cabinet | Bass reflex, flared rear port |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ascend Acoustics Sierra-LX vs Wharfedale Linton 85
- Ascend Acoustics Sierra-LX vs Revel M126Be
- Ascend Acoustics Sierra-LX vs Philharmonic BMR (v1)
- Ascend Acoustics Sierra-LX vs Ascend Acoustics Sierra-2EX V2
- Ascend Acoustics Sierra-LX vs Dynaudio Heritage Special
- Ascend Acoustics Sierra-LX vs Radiant Acoustics Clarity 6.2
- Ascend Acoustics Sierra-LX vs MoFi SourcePoint 10
- Ascend Acoustics Sierra-LX vs Wharfedale Super Linton
- See all 49 comparisons
Ascend Acoustics CMT-340 SE2: $798 per pair Ascend Acoustics $798 eBay
Older model: the Ascend Acoustics CMT-340 SE Center (rated 3.7/5). See every Ascend CBM, HTM and CMT generation.
Same family: the Ascend Acoustics CBM-170 SE2 (smaller bookshelf, ranked lower, rated 3.8/5) and the Ascend Acoustics HTM-200SE2 (smaller bookshelf, rated 4.3/5).
Pros: High-quality manufacturer Klippel NFS data shows 0.295dB on-axis average absolute deviation, 0.531 listening-window smoothness, and a strong 7.99 preference score with a subwoofer. Its dual 6.5-inch woofers, 92dB anechoic sensitivity, and 240W continuous power rating support high output and dynamics. Measured bass extension of 77.6Hz (-3dB).
Cons: Bass rolls off early for the cabinet size, measuring 77.6Hz at -3dB, 64.5Hz at -6dB, and 48.3Hz at -12dB; the preference score without a subwoofer is only 5.33. The 4.35 sound-power directivity-index standard deviation also indicates more off-axis variation than the strongest designs, and the rear port needs placement clearance.
Full Ascend Acoustics CMT-340 SE2 review and specifications →
| Released | Nov 2022 (3 years ago) |
|---|---|
| Bass Extension (-10dB) | approximately 53Hz (measured, spinorama.org) |
| Bass Extension (-3dB) | 77.6Hz (measured, spinorama.org) |
| DIY Kit | No |
| Dimensions | 21 x 7.5 x 10.5 in each |
| Drivers | Two 6.5-inch woofers; 27mm soft-dome tweeter |
| Impedance | 8 ohms nominal |
| Power Handling | 240W continuous; 400W short-term peak |
| Sensitivity | 92dB at 2.83V/1m anechoic |
| Spinorama Preference Score | 5.33 |
| Spinorama Preference Score with Perfect Sub | 7.99 |
| Weight | 29.1 lbs (13.2 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ascend Acoustics CMT-340 SE2 vs Arendal 1528 Monitor 8
- Ascend Acoustics CMT-340 SE2 vs Wharfedale Super Linton
- Ascend Acoustics CMT-340 SE2 vs MoFi SourcePoint 10
- Ascend Acoustics CMT-340 SE2 vs AsciLab F6Bs
- Ascend Acoustics CMT-340 SE2 vs Radiant Acoustics Clarity 6.2
- Ascend Acoustics CMT-340 SE2 vs Dynaudio Heritage Special
- Ascend Acoustics CMT-340 SE2 vs MoFi SourcePoint 8
- Ascend Acoustics CMT-340 SE2 vs Buchardt Audio E50
- See all 47 comparisons