Short answer: the Ascend Acoustics Sierra-LX. It ranks #38 of 203 bookshelf speakers by sound quality, rated 4.3/5, at $1,598; the Sonus Faber Sonetto II G2 ranks #168, rated 3.1/5, and costs $3,500, so there is little reason to consider the other one.
The Ascend Acoustics Sierra-LX is the more accurate, deeper-bass option. 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 4.25 for the Sonus Faber Sonetto II G2. Its bass reaches about 47Hz before falling 3dB, against 62Hz for the Sonus Faber Sonetto II G2. The catch: Very low sensitivity at about 81dB, so it needs a genuinely powerful amplifier to reach normal listening levels.
Why pick the Sonus Faber Sonetto II G2: Two-way design with a 1.125” damped Apex Dome silk tweeter and 6.5” cone woofer, using a base of concrete, aluminum, and steel with under-cabinet venting. The catch: Sounds notably bright pointed directly on-axis; toeing the speaker out about 30° reduces treble energy and sibilance meaningfully.
Buy the Ascend Acoustics Sierra-LX. It is rated higher for sound quality than the Sonus Faber Sonetto II G2 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| Ascend Acoustics Sierra-LX | Sonus Faber Sonetto II G2 | |
|---|---|---|
| Price | $1598 per pair | $3500 per pair |
| Ranked | #38 of 203 in Large Size Bookshelf Speakers | #168 of 203 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) | 38Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 47Hz (measured, Erin’s Audio Corner) | 62Hz (measured, Erin’s Audio Corner) |
| Dimensions | 14.3” x 7.5” x 10.5” (362 x 191 x 267 mm) | 16.3”H x 8.9”W x 14”D (414.3 x 227.0 x 355.6 mm) |
| Impedance | 8 ohms nominal (5.5 ohms minimum) | 4 ohms nominal (4.2 ohms minimum, measured by Erin’s Audio Corner) |
| Sensitivity | 81dB (2.83V/1m, measured by Erin’s Audio Corner) | 87dB (measured, Erin’s Audio Corner) |
| Drivers | 6” aluminum cone woofer, 26mm dome tweeter | 1x 6.5” mid-woofer (paper cone), 1x 1.1” (28mm) DAD soft dome tweeter |
| Weight | 20.9 lbs (9.5 kg) | 38.4 lbs (17.4 kg) |
| Woofer Cabinet | Bass reflex, flared rear port | ported, front |
| Power Handling | 350W continuous, 500W peak | - |
| Frequency Response | 28Hz - 23kHz (in-room, manufacturer specified) | - |
| Country | USA | - |
| Spinorama Preference Score | 6.63 | 4.25 |
| Spinorama Preference Score with Perfect Sub | 8.44 | 6.54 |
| DIY Kit | No | No |
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Prices on this page were last checked October 7, 2026 at 9:25 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 eBay
Same family: the Ascend 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).
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 →
| 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
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Sonus Faber Sonetto II G2: $3500 per pair Crutchfield eBay
Older model: the Sonus Faber Sonetto II (ranked lower, rated 3/5).
Same family: the Sonus Faber Sonetto I G2 (smaller bookshelf, estimated 3/5), the Sonus Faber Sonetto III G2 (smaller floorstanding, estimated 3.2/5), the Sonus Faber Sonetto V G2 (larger floorstanding, estimated 3.3/5) and the Sonus Faber Sonetto Center G2 (center, estimated 3/5).
Pros: Two-way design with a 1.125” damped Apex Dome silk tweeter and 6.5” cone woofer, using a base of concrete, aluminum, and steel with under-cabinet venting. Notably more neutral than Sonus Faber’s own Lumina 2, which runs 2-5dB hotter in the treble. Horizontal directivity narrows at a fairly constant, well-behaved rate rather than narrowing-then-widening-then-narrowing like some rivals (including the Lumina 2), meaning sidewall reflections match the direct sound well enough that the reviewer doesn’t recommend sidewall absorption for this speaker. The tweeter-to-woofer crossover handoff around 3kHz looks clean, suggesting a higher-order crossover than typical for the size/price class. Good dynamic range: the low end loses only about 2dB from 76dB to 96dB, otherwise holding up well. Not a difficult amplifier load (about 4.2 ohms minimum impedance). Bass extension reaches a genuine 50Hz in-room, fuller than the Lumina 2. Measured bass extension of 62Hz (-3dB), with a measured sensitivity of 87dB.
Cons: Sounds notably bright pointed directly on-axis; toeing the speaker out about 30° reduces treble energy and sibilance meaningfully. A resonance around 700Hz gives vocals a slightly nasal, hollow quality. A dip in the upper midrange (roughly 1-2kHz) reduces perceived detail and attack, while the elevated treble can read as “analytical” or “detailed” to some listeners despite being a coloration rather than true resolution. Needs more clearance from the rear wall than some rivals (about 1.5-2 feet in an ideal room, more or less depending on your specific room modes) or the 80-120Hz region can become boomy. Vertical listening window is limited to about ±10-15° from the tweeter axis. Some unexplained directivity irregularities appear around 1.2kHz and 1.6kHz, possibly port-related, along with a longer decay in the 800Hz-1600Hz range in burst-decay measurements. Multitone distortion approaches the reviewer’s 3% threshold through the midrange, though likely not obviously audible without direct A/B comparison. A resonance in the cabinet appears around 400Hz in impedance measurements.
Full Sonus Faber Sonetto II G2 review and specifications →
| Bass Extension (-10dB) | 38Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 62Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 16.3”H x 8.9”W x 14”D (414.3 x 227.0 x 355.6 mm) |
| Drivers | 1x 6.5” mid-woofer (paper cone), 1x 1.1” (28mm) DAD soft dome tweeter |
| Impedance | 4 ohms nominal (4.2 ohms minimum, measured by Erin’s Audio Corner) |
| Sensitivity | 87dB (measured, Erin’s Audio Corner) |
| Spinorama Preference Score | 4.25 |
| Spinorama Preference Score with Perfect Sub | 6.54 |
| Weight | 38.4 lbs (17.4 kg) |
| Woofer Cabinet | ported, front |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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